diff --git a/ompi/mca/coll/ucg/coll_ucg_component.c b/ompi/mca/coll/ucg/coll_ucg_component.c
index ece53e49210f236a41f50608b190f03f0f1f1a14..2fb96b32a8c90e19186d7ba05760b247e05da20c 100644
--- a/ompi/mca/coll/ucg/coll_ucg_component.c
+++ b/ompi/mca/coll/ucg/coll_ucg_component.c
@@ -74,7 +74,7 @@ mca_coll_ucg_component_t mca_coll_ucg_component = {
     /* MCA parameter */
     .priority = 90,             /* priority */
     .verbose = 2,               /* verbose level */
-    .max_rcache_size = 1024,
+    .max_rcache_size = 10,
     .disable_coll = NULL,
     .topology = NULL,