diff --git a/ompi/mca/coll/base/coll_base_util.c b/ompi/mca/coll/base/coll_base_util.c
index 552cd3fb6a..c45f10024d 100644
--- a/ompi/mca/coll/base/coll_base_util.c
+++ b/ompi/mca/coll/base/coll_base_util.c
@@ -257,7 +257,7 @@ static int free_vecs_callback(struct ompi_request_t **rptr) {
 }
 
 int ompi_coll_base_retain_datatypes_w( ompi_request_t *req,
-                                       ompi_datatype_t *stypes[], ompi_datatype_t *rtypes[]) {
+                                       ompi_datatype_t *const stypes[], ompi_datatype_t *const rtypes[]) {
     ompi_coll_base_nbc_request_t *request = (ompi_coll_base_nbc_request_t *)req;
     bool retain = false;
     ompi_communicator_t *comm = request->super.req_mpi_object.comm;
diff --git a/ompi/mca/coll/base/coll_base_util.h b/ompi/mca/coll/base/coll_base_util.h
index c793a1f7a4..46c9515346 100644
--- a/ompi/mca/coll/base/coll_base_util.h
+++ b/ompi/mca/coll/base/coll_base_util.h
@@ -174,8 +174,8 @@ int ompi_coll_base_retain_datatypes( ompi_request_t *request,
  * (will be cast internally).
  */
 int ompi_coll_base_retain_datatypes_w( ompi_request_t *request,
-                                       ompi_datatype_t *stypes[],
-                                       ompi_datatype_t *rtypes[]);
+                                       ompi_datatype_t * const stypes[],
+                                       ompi_datatype_t * const rtypes[]);
 
 /* File reading function */
 int ompi_coll_base_file_getnext_long(FILE *fptr, int *fileline, long* val);