diff --git a/src/backend/utils/cache/inval.c b/src/backend/utils/cache/inval.c
index 5803518229..f7405963ae 100644
--- a/src/backend/utils/cache/inval.c
+++ b/src/backend/utils/cache/inval.c
@@ -178,7 +178,7 @@ 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