diff --git a/src/backend/replication/logical/worker.c b/src/backend/replication/logical/worker.c
index 334bf3e7aff..66cc4ec49a1 100644
--- a/src/backend/replication/logical/worker.c
+++ b/src/backend/replication/logical/worker.c
@@ -3885,8 +3885,10 @@ send_feedback(XLogRecPtr recvpos, bool force, bool requestReply)
 	if (!reply_message)
 	{
 		MemoryContext oldctx = MemoryContextSwitchTo(ApplyContext);
-
-		reply_message = makeStringInfo();
+		int		initsize = 
+			sizeof(char) + sizeof(int64) * 3 +
+			sizeof(TimestampTz) + sizeof(bool) + 1;
+		reply_message = makeStringInfoExtended(initsize);
 		MemoryContextSwitchTo(oldctx);
 	}
 	else