diff --git a/ompi/mpi/c/win_create.c b/ompi/mpi/c/win_create.c
index 08966a7cbd..e33c2bc0f7 100644
--- a/ompi/mpi/c/win_create.c
+++ b/ompi/mpi/c/win_create.c
@@ -55,6 +55,8 @@ int MPI_Win_create(void *base, MPI_Aint size, int disp_unit,
 
         } else if (NULL == win) {
             return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_WIN, FUNC_NAME);
+        } else if ( (size < 0) || (disp_unit <= 0) ) {
+            return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_WIN, FUNC_NAME);
         }
     }