diff --git a/contrib/platform/mellanox/optimized b/contrib/platform/mellanox/optimized
index fdde7cfc15f..18f011d4d6a 100644
--- a/contrib/platform/mellanox/optimized
+++ b/contrib/platform/mellanox/optimized
@@ -1,6 +1,6 @@
 enable_mca_no_build=coll-ml,btl-uct
 enable_debug_symbols=yes
-enable_orterun_prefix_by_default=yes
+enable_mpirun_prefix_by_default=yes
 with_devel_headers=yes
 enable_oshmem=yes
 enable_oshmem_fortran=yes
diff --git a/ompi/mca/coll/ucc/coll_ucc.h b/ompi/mca/coll/ucc/coll_ucc.h
index 447da01eb3c..93370a8fd74 100644
--- a/ompi/mca/coll/ucc/coll_ucc.h
+++ b/ompi/mca/coll/ucc/coll_ucc.h
@@ -40,6 +40,11 @@ BEGIN_C_DECLS
                          "iallgatherv,ireduce,igather,igatherv,ireduce_scatter_block,"\
                          "ireduce_scatter,iscatterv,iscatter"
 
+#define mca_coll_ucc_call_previous(__api, ucc_module, ...) \
+    (ucc_module->previous_ ## __api == NULL ? \
+        UCC_ERR_NOT_SUPPORTED : \
+        ucc_module->previous_ ## __api (__VA_ARGS__, ucc_module->previous_ ## __api ## _module))
+
 typedef struct mca_coll_ucc_req {
     ompi_request_t super;
     ucc_coll_req_h ucc_req;
diff --git a/ompi/mca/coll/ucc/coll_ucc_allgather.c b/ompi/mca/coll/ucc/coll_ucc_allgather.c
index 89f4eb1dec1..776109c8fd2 100644
--- a/ompi/mca/coll/ucc/coll_ucc_allgather.c
+++ b/ompi/mca/coll/ucc/coll_ucc_allgather.c
@@ -77,8 +77,9 @@ int mca_coll_ucc_allgather(const void *sbuf, int scount, struct ompi_datatype_t
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback allgather");
-    return ucc_module->previous_allgather(sbuf, scount, sdtype, rbuf, rcount, rdtype,
-                                          comm, ucc_module->previous_allgather_module);
+
+    return mca_coll_ucc_call_previous(allgather, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
 }
 
 int mca_coll_ucc_iallgather(const void *sbuf, int scount, struct ompi_datatype_t *sdtype,
@@ -104,6 +105,7 @@ int mca_coll_ucc_iallgather(const void *sbuf, int scount, struct ompi_datatype_t
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_iallgather(sbuf, scount, sdtype, rbuf, rcount, rdtype,
-                                           comm, request, ucc_module->previous_iallgather_module);
+
+    return mca_coll_ucc_call_previous(iallgather, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_allgatherv.c b/ompi/mca/coll/ucc/coll_ucc_allgatherv.c
index 8d55713f944..8652a360eb8 100644
--- a/ompi/mca/coll/ucc/coll_ucc_allgatherv.c
+++ b/ompi/mca/coll/ucc/coll_ucc_allgatherv.c
@@ -78,9 +78,8 @@ int mca_coll_ucc_allgatherv(const void *sbuf, int scount,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback allgatherv");
-    return ucc_module->previous_allgatherv(sbuf, scount, sdtype,
-                                           rbuf, rcounts, rdisps, rdtype,
-                                           comm, ucc_module->previous_allgatherv_module);
+    return mca_coll_ucc_call_previous(allgatherv, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcounts, rdisps, rdtype, comm);
 }
 
 int mca_coll_ucc_iallgatherv(const void *sbuf, int scount,
@@ -108,7 +107,6 @@ int mca_coll_ucc_iallgatherv(const void *sbuf, int scount,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_iallgatherv(sbuf, scount, sdtype,
-                                            rbuf, rcounts, rdisps, rdtype,
-                                            comm, request, ucc_module->previous_iallgatherv_module);
+    return mca_coll_ucc_call_previous(iallgatherv, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcounts, rdisps, rdtype, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_allreduce.c b/ompi/mca/coll/ucc/coll_ucc_allreduce.c
index c65f8a317ef..3ed8e8cc372 100644
--- a/ompi/mca/coll/ucc/coll_ucc_allreduce.c
+++ b/ompi/mca/coll/ucc/coll_ucc_allreduce.c
@@ -74,8 +74,8 @@ int mca_coll_ucc_allreduce(const void *sbuf, void *rbuf, int count,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback allreduce");
-    return ucc_module->previous_allreduce(sbuf, rbuf, count, dtype, op,
-                                          comm, ucc_module->previous_allreduce_module);
+    return mca_coll_ucc_call_previous(allreduce, ucc_module,
+        sbuf, rbuf, count, dtype, op, comm);
 }
 
 int mca_coll_ucc_iallreduce(const void *sbuf, void *rbuf, int count,
@@ -100,6 +100,6 @@ int mca_coll_ucc_iallreduce(const void *sbuf, void *rbuf, int count,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_iallreduce(sbuf, rbuf, count, dtype, op,
-                                           comm, request, ucc_module->previous_iallreduce_module);
+    return mca_coll_ucc_call_previous(iallreduce, ucc_module,
+        sbuf, rbuf, count, dtype, op, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_alltoall.c b/ompi/mca/coll/ucc/coll_ucc_alltoall.c
index b3e06c99007..6b921033a57 100644
--- a/ompi/mca/coll/ucc/coll_ucc_alltoall.c
+++ b/ompi/mca/coll/ucc/coll_ucc_alltoall.c
@@ -77,8 +77,8 @@ int mca_coll_ucc_alltoall(const void *sbuf, int scount, struct ompi_datatype_t *
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback alltoall");
-    return ucc_module->previous_alltoall(sbuf, scount, sdtype, rbuf, rcount, rdtype,
-                                          comm, ucc_module->previous_alltoall_module);
+    return mca_coll_ucc_call_previous(alltoall, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
 }
 
 int mca_coll_ucc_ialltoall(const void *sbuf, int scount, struct ompi_datatype_t *sdtype,
@@ -104,6 +104,6 @@ int mca_coll_ucc_ialltoall(const void *sbuf, int scount, struct ompi_datatype_t
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_ialltoall(sbuf, scount, sdtype, rbuf, rcount, rdtype,
-                                          comm, request, ucc_module->previous_ialltoall_module);
+    return mca_coll_ucc_call_previous(ialltoall, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_alltoallv.c b/ompi/mca/coll/ucc/coll_ucc_alltoallv.c
index 2dc1a121bf0..06ea98adfe2 100644
--- a/ompi/mca/coll/ucc/coll_ucc_alltoallv.c
+++ b/ompi/mca/coll/ucc/coll_ucc_alltoallv.c
@@ -79,9 +79,8 @@ int mca_coll_ucc_alltoallv(const void *sbuf, const int *scounts,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback alltoallv");
-    return ucc_module->previous_alltoallv(sbuf, scounts, sdisps, sdtype,
-                                          rbuf, rcounts, rdisps, rdtype,
-                                          comm, ucc_module->previous_alltoallv_module);
+    return mca_coll_ucc_call_previous(alltoallv, ucc_module,
+        sbuf, scounts, sdisps, sdtype, rbuf, rcounts, rdisps, rdtype, comm);
 }
 
 int mca_coll_ucc_ialltoallv(const void *sbuf, const int *scounts,
@@ -109,7 +108,6 @@ int mca_coll_ucc_ialltoallv(const void *sbuf, const int *scounts,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_ialltoallv(sbuf, scounts, sdisps, sdtype,
-                                          rbuf, rcounts, rdisps, rdtype,
-                                           comm, request, ucc_module->previous_ialltoallv_module);
+    return mca_coll_ucc_call_previous(ialltoallv, ucc_module,
+        sbuf, scounts, sdisps, sdtype, rbuf, rcounts, rdisps, rdtype, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_barrier.c b/ompi/mca/coll/ucc/coll_ucc_barrier.c
index 010ca177fdf..9790fffc2f9 100644
--- a/ompi/mca/coll/ucc/coll_ucc_barrier.c
+++ b/ompi/mca/coll/ucc/coll_ucc_barrier.c
@@ -36,7 +36,7 @@ int mca_coll_ucc_barrier(struct ompi_communicator_t *comm,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback barrier");
-    return ucc_module->previous_barrier(comm, ucc_module->previous_barrier_module);
+    return mca_coll_ucc_call_previous(barrier, ucc_module, comm);
 }
 
 int mca_coll_ucc_ibarrier(struct ompi_communicator_t *comm,
@@ -58,6 +58,5 @@ int mca_coll_ucc_ibarrier(struct ompi_communicator_t *comm,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_ibarrier(comm, request,
-                                         ucc_module->previous_ibarrier_module);
+    return mca_coll_ucc_call_previous(ibarrier, ucc_module, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_bcast.c b/ompi/mca/coll/ucc/coll_ucc_bcast.c
index 820d9f90f30..fb80fb03f8a 100644
--- a/ompi/mca/coll/ucc/coll_ucc_bcast.c
+++ b/ompi/mca/coll/ucc/coll_ucc_bcast.c
@@ -51,8 +51,9 @@ int mca_coll_ucc_bcast(void *buf, int count, struct ompi_datatype_t *dtype,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback bcast");
-    return ucc_module->previous_bcast(buf, count, dtype, root,
-                                       comm, ucc_module->previous_bcast_module);
+    return mca_coll_ucc_call_previous(bcast, ucc_module,
+        buf, count, dtype, root, comm);
+
 }
 
 int mca_coll_ucc_ibcast(void *buf, int count, struct ompi_datatype_t *dtype,
@@ -76,6 +77,6 @@ int mca_coll_ucc_ibcast(void *buf, int count, struct ompi_datatype_t *dtype,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_ibcast(buf, count, dtype, root,
-                                       comm, request, ucc_module->previous_ibcast_module);
+    return mca_coll_ucc_call_previous(ibcast, ucc_module,
+        buf, count, dtype, root, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_gather.c b/ompi/mca/coll/ucc/coll_ucc_gather.c
index c37edcc08e3..f74dc25d8a0 100644
--- a/ompi/mca/coll/ucc/coll_ucc_gather.c
+++ b/ompi/mca/coll/ucc/coll_ucc_gather.c
@@ -91,9 +91,8 @@ int mca_coll_ucc_gather(const void *sbuf, int scount, struct ompi_datatype_t *sd
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback gather");
-    return ucc_module->previous_gather(sbuf, scount, sdtype, rbuf, rcount,
-                                       rdtype, root, comm,
-                                       ucc_module->previous_gather_module);
+    return mca_coll_ucc_call_previous(gather, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, root, comm);
 }
 
 int mca_coll_ucc_igather(const void *sbuf, int scount, struct ompi_datatype_t *sdtype,
@@ -119,7 +118,6 @@ int mca_coll_ucc_igather(const void *sbuf, int scount, struct ompi_datatype_t *s
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_igather(sbuf, scount, sdtype, rbuf, rcount,
-                                        rdtype, root, comm, request,
-                                        ucc_module->previous_igather_module);
+    return mca_coll_ucc_call_previous(igather, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, root, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_gatherv.c b/ompi/mca/coll/ucc/coll_ucc_gatherv.c
index 6f4147c4d00..15023698ffa 100644
--- a/ompi/mca/coll/ucc/coll_ucc_gatherv.c
+++ b/ompi/mca/coll/ucc/coll_ucc_gatherv.c
@@ -86,9 +86,8 @@ int mca_coll_ucc_gatherv(const void *sbuf, int scount, struct ompi_datatype_t *s
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback gatherv");
-    return ucc_module->previous_gatherv(sbuf, scount, sdtype, rbuf, rcounts,
-                                        disps, rdtype, root, comm,
-                                        ucc_module->previous_gatherv_module);
+    return mca_coll_ucc_call_previous(gatherv, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcounts, disps, rdtype, root, comm);
 }
 
 int mca_coll_ucc_igatherv(const void *sbuf, int scount, struct ompi_datatype_t *sdtype,
@@ -115,7 +114,6 @@ int mca_coll_ucc_igatherv(const void *sbuf, int scount, struct ompi_datatype_t *
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_igatherv(sbuf, scount, sdtype, rbuf, rcounts,
-                                         disps, rdtype, root, comm, request,
-                                         ucc_module->previous_igatherv_module);
+    return mca_coll_ucc_call_previous(igatherv, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcounts, disps, rdtype, root, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_module.c b/ompi/mca/coll/ucc/coll_ucc_module.c
index 14d3d732b9a..3cf73d4ee25 100644
--- a/ompi/mca/coll/ucc/coll_ucc_module.c
+++ b/ompi/mca/coll/ucc/coll_ucc_module.c
@@ -141,13 +141,12 @@ static void mca_coll_ucc_module_destruct(mca_coll_ucc_module_t *ucc_module)
 #define SAVE_PREV_COLL_API(__api) do {                                                       \
         ucc_module->previous_ ## __api            = comm->c_coll->coll_ ## __api;            \
         ucc_module->previous_ ## __api ## _module = comm->c_coll->coll_ ## __api ## _module; \
-        if (!comm->c_coll->coll_ ## __api || !comm->c_coll->coll_ ## __api ## _module) {     \
-            return OMPI_ERROR;                                                               \
+        if (comm->c_coll->coll_ ## __api && comm->c_coll->coll_ ## __api ## _module) {       \
+            OBJ_RETAIN(ucc_module->previous_ ## __api ## _module);                           \
         }                                                                                    \
-        OBJ_RETAIN(ucc_module->previous_ ## __api ## _module);                               \
     } while(0)
 
-static int mca_coll_ucc_save_coll_handlers(mca_coll_ucc_module_t *ucc_module)
+static void mca_coll_ucc_save_coll_handlers(mca_coll_ucc_module_t *ucc_module)
 {
     ompi_communicator_t *comm = ucc_module->comm;
     SAVE_PREV_COLL_API(allreduce);
@@ -178,7 +177,6 @@ static int mca_coll_ucc_save_coll_handlers(mca_coll_ucc_module_t *ucc_module)
     SAVE_PREV_COLL_API(iscatterv);
     SAVE_PREV_COLL_API(scatter);
     SAVE_PREV_COLL_API(iscatter);
-    return OMPI_SUCCESS;
 }
 
 /*
@@ -470,11 +468,6 @@ static int mca_coll_ucc_module_enable(mca_coll_base_module_t *module,
                 (void*)comm, (long long unsigned)team_params.id,
                 ompi_comm_size(comm));
 
-    if (OMPI_SUCCESS != mca_coll_ucc_save_coll_handlers(ucc_module)){
-        UCC_ERROR("mca_coll_ucc_save_coll_handlers failed");
-        goto err;
-    }
-
     if (UCC_OK != ucc_team_create_post(&cm->ucc_context, 1,
                                        &team_params, &ucc_module->ucc_team)) {
         UCC_ERROR("ucc_team_create_post failed");
@@ -495,6 +488,9 @@ static int mca_coll_ucc_module_enable(mca_coll_base_module_t *module,
         UCC_ERROR("ucc ompi_attr_set_c failed");
         goto err;
     }
+
+    mca_coll_ucc_save_coll_handlers(ucc_module);
+
     return OMPI_SUCCESS;
 
 err:
diff --git a/ompi/mca/coll/ucc/coll_ucc_reduce.c b/ompi/mca/coll/ucc/coll_ucc_reduce.c
index 0ed949e9d70..0de4b2ff421 100644
--- a/ompi/mca/coll/ucc/coll_ucc_reduce.c
+++ b/ompi/mca/coll/ucc/coll_ucc_reduce.c
@@ -76,8 +76,8 @@ int mca_coll_ucc_reduce(const void *sbuf, void* rbuf, int count,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback reduce");
-    return ucc_module->previous_reduce(sbuf, rbuf, count, dtype, op, root,
-                                       comm, ucc_module->previous_reduce_module);
+    return mca_coll_ucc_call_previous(reduce, ucc_module,
+        sbuf, rbuf, count, dtype, op, root, comm);
 }
 
 int mca_coll_ucc_ireduce(const void *sbuf, void* rbuf, int count,
@@ -103,6 +103,6 @@ int mca_coll_ucc_ireduce(const void *sbuf, void* rbuf, int count,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_ireduce(sbuf, rbuf, count, dtype, op, root,
-                                        comm, request, ucc_module->previous_ireduce_module);
+    return mca_coll_ucc_call_previous(ireduce, ucc_module,
+        sbuf, rbuf, count, dtype, op, root, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_reduce_scatter.c b/ompi/mca/coll/ucc/coll_ucc_reduce_scatter.c
index 15771e48f1b..93a9b295ac0 100644
--- a/ompi/mca/coll/ucc/coll_ucc_reduce_scatter.c
+++ b/ompi/mca/coll/ucc/coll_ucc_reduce_scatter.c
@@ -87,9 +87,8 @@ int mca_coll_ucc_reduce_scatter(const void *sbuf, void *rbuf, const int *rcounts
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback reduce_scatter");
-    return ucc_module->previous_reduce_scatter(sbuf, rbuf, rcounts, dtype, op,
-                                               comm,
-                                               ucc_module->previous_reduce_scatter_module);
+    return mca_coll_ucc_call_previous(reduce_scatter, ucc_module,
+        sbuf, rbuf, rcounts, dtype, op, comm);
 }
 
 int mca_coll_ucc_ireduce_scatter(const void *sbuf, void *rbuf, const int *rcounts,
@@ -115,7 +114,6 @@ int mca_coll_ucc_ireduce_scatter(const void *sbuf, void *rbuf, const int *rcount
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_ireduce_scatter(sbuf, rbuf, rcounts, dtype, op,
-                                                comm, request,
-                                                ucc_module->previous_ireduce_scatter_module);
+    return mca_coll_ucc_call_previous(ireduce_scatter, ucc_module,
+        sbuf, rbuf, rcounts, dtype, op, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_reduce_scatter_block.c b/ompi/mca/coll/ucc/coll_ucc_reduce_scatter_block.c
index e12f472733e..e9352d669e2 100644
--- a/ompi/mca/coll/ucc/coll_ucc_reduce_scatter_block.c
+++ b/ompi/mca/coll/ucc/coll_ucc_reduce_scatter_block.c
@@ -82,9 +82,8 @@ int mca_coll_ucc_reduce_scatter_block(const void *sbuf, void *rbuf, int rcount,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback reduce_scatter_block");
-    return ucc_module->previous_reduce_scatter_block(sbuf, rbuf, rcount, dtype,
-                                                     op, comm,
-                                                     ucc_module->previous_reduce_scatter_block_module);
+    return mca_coll_ucc_call_previous(reduce_scatter_block, ucc_module,
+        sbuf, rbuf, rcount, dtype, op, comm);
 }
 
 int mca_coll_ucc_ireduce_scatter_block(const void *sbuf, void *rbuf, int rcount,
@@ -111,7 +110,6 @@ int mca_coll_ucc_ireduce_scatter_block(const void *sbuf, void *rbuf, int rcount,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_ireduce_scatter_block(sbuf, rbuf, rcount, dtype,
-                                                      op, comm, request,
-                                                      ucc_module->previous_ireduce_scatter_block_module);
+    return mca_coll_ucc_call_previous(ireduce_scatter_block, ucc_module,
+        sbuf, rbuf, rcount, dtype, op, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_scatter.c b/ompi/mca/coll/ucc/coll_ucc_scatter.c
index 3bb90e5b1fa..6154e820b40 100644
--- a/ompi/mca/coll/ucc/coll_ucc_scatter.c
+++ b/ompi/mca/coll/ucc/coll_ucc_scatter.c
@@ -87,10 +87,8 @@ int mca_coll_ucc_scatter(const void *sbuf, int scount,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback scatter");
-    return ucc_module->previous_scatter(sbuf, scount, sdtype, rbuf, rcount,
-                                        rdtype, root, comm,
-                                        ucc_module->previous_scatter_module);
-
+    return mca_coll_ucc_call_previous(scatter, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, root, comm);
 }
 
 int mca_coll_ucc_iscatter(const void *sbuf, int scount,
@@ -117,7 +115,6 @@ int mca_coll_ucc_iscatter(const void *sbuf, int scount,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_iscatter(sbuf, scount, sdtype, rbuf, rcount,
-                                         rdtype, root, comm, request,
-                                         ucc_module->previous_iscatter_module);
+    return mca_coll_ucc_call_previous(iscatter, ucc_module,
+        sbuf, scount, sdtype, rbuf, rcount, rdtype, root, comm, request);
 }
diff --git a/ompi/mca/coll/ucc/coll_ucc_scatterv.c b/ompi/mca/coll/ucc/coll_ucc_scatterv.c
index a6444bac02a..848508e8bc6 100644
--- a/ompi/mca/coll/ucc/coll_ucc_scatterv.c
+++ b/ompi/mca/coll/ucc/coll_ucc_scatterv.c
@@ -90,9 +90,8 @@ int mca_coll_ucc_scatterv(const void *sbuf, const int *scounts,
     return OMPI_SUCCESS;
 fallback:
     UCC_VERBOSE(3, "running fallback scatterv");
-    return ucc_module->previous_scatterv(sbuf, scounts, disps, sdtype, rbuf,
-                                         rcount, rdtype, root, comm,
-                                         ucc_module->previous_scatterv_module);
+    return mca_coll_ucc_call_previous(scatterv, ucc_module,
+        sbuf, scounts, disps, sdtype, rbuf, rcount, rdtype, root, comm);
 }
 
 int mca_coll_ucc_iscatterv(const void *sbuf, const int *scounts,
@@ -120,7 +119,6 @@ int mca_coll_ucc_iscatterv(const void *sbuf, const int *scounts,
     if (coll_req) {
         mca_coll_ucc_req_free((ompi_request_t **)&coll_req);
     }
-    return ucc_module->previous_iscatterv(sbuf, scounts, disps, sdtype, rbuf,
-                                          rcount, rdtype, root, comm, request,
-                                          ucc_module->previous_iscatterv_module);
+    return mca_coll_ucc_call_previous(iscatterv, ucc_module,
+        sbuf, scounts, disps, sdtype, rbuf, rcount, rdtype, root, comm, request);
 }