diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c
index 064ddd5..1d4cbc4 100644
--- a/src/backend/replication/walsender.c
+++ b/src/backend/replication/walsender.c
@@ -1555,11 +1555,11 @@ pg_stat_get_wal_senders(PG_FUNCTION_ARGS)
 		if (walsnd->pid != 0)
 		{
 			/*
-			 * Treat a standby such as a pg_basebackup background process
-			 * which always returns an invalid flush location, as an
+			 * Treat a standby such as a pg_basebackup background process which
+			 * always returns 0/0 (InvalidXLogRecPtr) as flush location, as an
 			 * asynchronous standby.
 			 */
-			sync_priority[i] = XLogRecPtrIsInvalid(walsnd->flush) ?
+			sync_priority[i] = XLByteEQ(walsnd->flush, InvalidXLogRecPtr) ?
 				0 : walsnd->sync_standby_priority;
 
 			if (walsnd->state == WALSNDSTATE_STREAMING &&