diff --git a/ompi/mca/coll/tuned/coll_tuned_decision_fixed.c b/ompi/mca/coll/tuned/coll_tuned_decision_fixed.c
index 45cdc2b51a..6316ad3043 100644
--- a/ompi/mca/coll/tuned/coll_tuned_decision_fixed.c
+++ b/ompi/mca/coll/tuned/coll_tuned_decision_fixed.c
@@ -709,7 +709,7 @@ int ompi_coll_tuned_scatter_intra_dec_fixed(void *sbuf, int scount,
 					    int root, struct ompi_communicator_t *comm)
 {
     const size_t small_block_size = 300;
-    const size_t small_comm_size = 10;
+    const int small_comm_size = 10;
     int communicator_size;
     size_t rdsize, block_size;