diff --git a/ompi/mca/pml/ucx/pml_ucx_request.h b/ompi/mca/pml/ucx/pml_ucx_request.h
index 5aa657eccbd..616ec84d794 100644
--- a/ompi/mca/pml/ucx/pml_ucx_request.h
+++ b/ompi/mca/pml/ucx/pml_ucx_request.h
@@ -89,7 +89,7 @@ enum {
 #define PML_UCX_MESSAGE_RELEASE(_message) \
     { \
         ompi_message_return(*(_message)); \
-        *(_message) = NULL; \
+        *(_message) = MPI_MESSAGE_NULL; \
     }
 
 
diff --git a/ompi/mca/pml/yalla/pml_yalla_request.h b/ompi/mca/pml/yalla/pml_yalla_request.h
index 6a4ed2d59a1..ff890656ef3 100644
--- a/ompi/mca/pml/yalla/pml_yalla_request.h
+++ b/ompi/mca/pml/yalla/pml_yalla_request.h
@@ -213,7 +213,7 @@ void mca_pml_yalla_init_reqs(void);
 #define PML_YALLA_MESSAGE_RELEASE(_message) \
     { \
         ompi_message_return(*(_message)); \
-        *(_message) = NULL; \
+        *(_message) = MPI_MESSAGE_NULL; \
     }
 
 #endif /* PML_YALLA_REQUEST_H_ */