diff --git a/ompi/mca/coll/base/coll_base_alltoallv.c b/ompi/mca/coll/base/coll_base_alltoallv.c
index 30258f68fe4..37bc22acf5c 100644
--- a/ompi/mca/coll/base/coll_base_alltoallv.c
+++ b/ompi/mca/coll/base/coll_base_alltoallv.c
@@ -92,7 +92,7 @@ mca_coll_base_alltoallv_intra_basic_inplace(const void *rbuf, ompi_count_array_t
         if( OPAL_UNLIKELY(opal_local_arch != ompi_proc->super.proc_convertor->master->remote_arch))  {
             packed_size = opal_datatype_compute_remote_size(&rdtype->super,
                                                             ompi_proc->super.proc_convertor->master->remote_sizes);
-            packed_size *= rcounts[right];
+            packed_size *= ompi_count_array_get(rcounts, right);
             max_size = packed_size > max_size ? packed_size : max_size;
         }
     }
diff --git a/ompi/request/request.c b/ompi/request/request.c
index 9e736e66a9e..843d9ae95f3 100644
--- a/ompi/request/request.c
+++ b/ompi/request/request.c
@@ -253,7 +253,8 @@ int ompi_request_persistent_noop_create(ompi_request_t** request)
 bool ompi_request_check_same_instance(ompi_request_t** requests,
                                       int count)
 {
-    ompi_request_t *req, *base = NULL;
+    ompi_instance_t* base_instance = NULL;
+    ompi_request_t *req;
 
     for(int idx = 0; idx < count; idx++ ) {
         req = requests[idx];
@@ -262,11 +263,11 @@ bool ompi_request_check_same_instance(ompi_request_t** requests,
         /* Only PML requests have support for MPI sessions */
         if(OMPI_REQUEST_PML != req->req_type)
             continue;
-        if(NULL == base) {
-            base = req;
+        if(NULL == base_instance) {
+            base_instance = req->req_mpi_object.comm->instance;
             continue;
         }
-        if(base->req_mpi_object.comm != req->req_mpi_object.comm)
+        if(base_instance != req->req_mpi_object.comm->instance)
             return false;
     }
     return true;