diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index 636f296b994..60985a68fb2 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -1082,9 +1082,6 @@ WalSndWriteData(LogicalDecodingContext *ctx, XLogRecPtr lsn, TransactionId xid,
 	TimestampTz	now;
 	int64 now_int;
 
-	/* output previously gathered data in a CopyData packet */
-	pq_putmessage_noblock('d', ctx->out->data, ctx->out->len);
-
 	/*
 	 * Fill the send timestamp last, so that it is taken as late as possible.
 	 * This is somewhat ugly, but the protocol's set as it's already used for
@@ -1097,6 +1094,9 @@ WalSndWriteData(LogicalDecodingContext *ctx, XLogRecPtr lsn, TransactionId xid,
 	memcpy(&ctx->out->data[1 + sizeof(int64) + sizeof(int64)],
 		   tmpbuf.data, sizeof(int64));
 
+	/* output previously gathered data in a CopyData packet */
+	pq_putmessage_noblock('d', ctx->out->data, ctx->out->len);
+
 	CHECK_FOR_INTERRUPTS();
 
 	/* Try to flush pending output to the client */