diff --git a/flang/lib/Optimizer/Transforms/CUFOpConversion.cpp b/flang/lib/Optimizer/Transforms/CUFOpConversion.cpp
index 1f0576aa82f83..2ab2d84f1643d 100644
--- a/flang/lib/Optimizer/Transforms/CUFOpConversion.cpp
+++ b/flang/lib/Optimizer/Transforms/CUFOpConversion.cpp
@@ -541,7 +541,8 @@ static mlir::Value getShapeFromDecl(mlir::Value src) {
 
 static mlir::Value emboxSrc(mlir::PatternRewriter &rewriter,
                             cuf::DataTransferOp op,
-                            const mlir::SymbolTable &symtab) {
+                            const mlir::SymbolTable &symtab,
+                            mlir::Type dstEleTy = nullptr) {
   auto mod = op->getParentOfType<mlir::ModuleOp>();
   mlir::Location loc = op.getLoc();
   fir::FirOpBuilder builder(rewriter, mod);
@@ -555,11 +556,21 @@ static mlir::Value emboxSrc(mlir::PatternRewriter &rewriter,
       // from a LOGICAL constant. Store it as a fir.logical.
       srcTy = fir::LogicalType::get(rewriter.getContext(), 4);
       src = createConvertOp(rewriter, loc, srcTy, src);
+      addr = builder.createTemporary(loc, srcTy);
+      builder.create<fir::StoreOp>(loc, src, addr);
+    } else {
+      if (dstEleTy && fir::isa_trivial(dstEleTy) && srcTy != dstEleTy) {
+        // Use dstEleTy and convert to avoid assign mismatch.
+        addr = builder.createTemporary(loc, dstEleTy);
+        auto conv = builder.create<fir::ConvertOp>(loc, dstEleTy, src);
+        builder.create<fir::StoreOp>(loc, conv, addr);
+        srcTy = dstEleTy;
+      } else {
+        // Put constant in memory if it is not.
+        addr = builder.createTemporary(loc, srcTy);
+        builder.create<fir::StoreOp>(loc, src, addr);
+      }
     }
-    // Put constant in memory if it is not.
-    mlir::Value alloc = builder.createTemporary(loc, srcTy);
-    builder.create<fir::StoreOp>(loc, src, alloc);
-    addr = alloc;
   } else {
     addr = op.getSrc();
   }
@@ -729,7 +740,7 @@ struct CUFDataTransferOpConversion
     };
 
     // Conversion of data transfer involving at least one descriptor.
-    if (mlir::isa<fir::BaseBoxType>(dstTy)) {
+    if (auto dstBoxTy = mlir::dyn_cast<fir::BaseBoxType>(dstTy)) {
       // Transfer to a descriptor.
       mlir::func::FuncOp func =
           isDstGlobal(op)
@@ -740,7 +751,8 @@ struct CUFDataTransferOpConversion
       mlir::Value dst = op.getDst();
       mlir::Value src = op.getSrc();
       if (!mlir::isa<fir::BaseBoxType>(srcTy)) {
-        src = emboxSrc(rewriter, op, symtab);
+        mlir::Type dstEleTy = fir::unwrapInnerType(dstBoxTy.getEleTy());
+        src = emboxSrc(rewriter, op, symtab, dstEleTy);
         if (fir::isa_trivial(srcTy))
           func = fir::runtime::getRuntimeFunc<mkRTKey(CUFDataTransferCstDesc)>(
               loc, builder);
diff --git a/flang/test/Fir/CUDA/cuda-data-transfer.fir b/flang/test/Fir/CUDA/cuda-data-transfer.fir
index b62c500f4a2d3..a724d9f681fb6 100644
--- a/flang/test/Fir/CUDA/cuda-data-transfer.fir
+++ b/flang/test/Fir/CUDA/cuda-data-transfer.fir
@@ -582,4 +582,26 @@ func.func @_QPchecksums(%arg0: !fir.box<!fir.array<?xf64>> {cuf.data_attr = #cuf
 // CHECK: %[[SRC:.*]] = fir.convert %{{.*}} : (!fir.ref<!fir.box<!fir.array<?xf64>>>) -> !fir.ref<!fir.box<none>>
 // CHECK: fir.call @_FortranACUFDataTransferDescDescNoRealloc(%[[DST]], %[[SRC]], %{{.*}}, %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.ref<!fir.box<none>>, i32, !fir.ref<i8>, i32) -> ()
 
+func.func @_QPsub20() {
+  %0 = cuf.alloc !fir.box<!fir.heap<f32>> {bindc_name = "r", data_attr = #cuf.cuda<device>, uniq_name = "_QFsub20Er"} -> !fir.ref<!fir.box<!fir.heap<f32>>>
+  %1 = fir.zero_bits !fir.heap<f32>
+  %2 = fir.embox %1 {allocator_idx = 2 : i32} : (!fir.heap<f32>) -> !fir.box<!fir.heap<f32>>
+  fir.store %2 to %0 : !fir.ref<!fir.box<!fir.heap<f32>>>
+  %3:2 = hlfir.declare %0 {data_attr = #cuf.cuda<device>, fortran_attrs = #fir.var_attrs<allocatable>, uniq_name = "_QFsub20Er"} : (!fir.ref<!fir.box<!fir.heap<f32>>>) -> (!fir.ref<!fir.box<!fir.heap<f32>>>, !fir.ref<!fir.box<!fir.heap<f32>>>)
+  %c0_i32 = arith.constant 0 : i32
+  cuf.data_transfer %c0_i32 to %3#0 {transfer_kind = #cuf.cuda_transfer<host_device>} : i32, !fir.ref<!fir.box<!fir.heap<f32>>>
+  return
+}
+
+// CHECK-LABEL:func.func @_QPsub20
+// CHECK: %[[BOX_ALLOCA:.*]] = fir.alloca !fir.box<f32>
+// CHECK: %[[TMP:.*]] = fir.alloca f32
+// CHECK: %[[CONV:.*]] = fir.convert %c0{{.*}} : (i32) -> f32
+// CHECK: fir.store %[[CONV]] to %[[TMP]] : !fir.ref<f32>
+// CHECK: %[[BOX:.*]] = fir.embox %[[TMP]] : (!fir.ref<f32>) -> !fir.box<f32>
+// CHECK: fir.store %[[BOX]] to %[[BOX_ALLOCA]] : !fir.ref<!fir.box<f32>>
+// CHECK: %[[BOX_NONE:.*]] = fir.convert %[[BOX_ALLOCA]] : (!fir.ref<!fir.box<f32>>) -> !fir.ref<!fir.box<none>>
+// CHECK: fir.call @_FortranACUFDataTransferCstDesc(%13, %[[BOX_NONE]], %c0{{.*}}, %{{.*}}, %{{.*}}) : (!fir.ref<!fir.box<none>>, !fir.ref<!fir.box<none>>, i32, !fir.ref<i8>, i32) -> ()
+
 } // end of module
+