diff --git a/src/backend/utils/cache/inval.c b/src/backend/utils/cache/inval.c
index 55e5c8cf74..685bbd3174 100644
--- a/src/backend/utils/cache/inval.c
+++ b/src/backend/utils/cache/inval.c
@@ -180,7 +180,7 @@ static int	maxSharedInvalidMessagesArray;
  * assumes there won't be very many of these at once; could improve if needed.
  */
 
-#define MAX_SYSCACHE_CALLBACKS 32
+#define MAX_SYSCACHE_CALLBACKS 64
 #define MAX_RELCACHE_CALLBACKS 10
 
 static struct SYSCACHECALLBACK