diff --git a/src/backend/utils/cache/relfilenodemap.c b/src/backend/utils/cache/relfilenodemap.c
index 557ff6148d0..bf7deb2c2ee 100644
--- a/src/backend/utils/cache/relfilenodemap.c
+++ b/src/backend/utils/cache/relfilenodemap.c
@@ -124,7 +124,7 @@ InitializeRelfilenodeMap(void)
 	 * error.
 	 */
 	RelfilenodeMapHash =
-		hash_create("RelfilenodeMap cache", 1024, &ctl,
+		hash_create("RelfilenodeMap cache", 64, &ctl,
 					HASH_ELEM | HASH_FUNCTION | HASH_CONTEXT);
 
 	/* Watch for invalidation events. */