diff --git a/dace/libraries/mpi/nodes/win_create.py b/dace/libraries/mpi/nodes/win_create.py
index e3f7ba10d0..7abfc02b96 100644
--- a/dace/libraries/mpi/nodes/win_create.py
+++ b/dace/libraries/mpi/nodes/win_create.py
@@ -29,7 +29,7 @@ def expansion(node, parent_state, parent_sdfg, **kwargs):
 
         code = f"""
             MPI_Win_create(_win_buffer,
-                           {win_buf_count_str},
+                           {win_buf_count_str} * sizeof({win_buffer_dtype}),
                            sizeof({win_buffer_dtype}),
                            MPI_INFO_NULL,
                            {comm},