diff --git a/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl b/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl
index 74b90d9a913..232dbbbc55e 100644
--- a/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl
+++ b/src/bin/pg_basebackup/t/040_pg_createsubscriber.pl
@@ -297,6 +297,17 @@ $node_p->safe_psql($db1,
 	"SELECT pg_create_logical_replication_slot('$fslotname', 'pgoutput', false, false, true)"
 );
 $node_s->start;
+$node_p->safe_psql($db1, qq(
+	SELECT pg_logical_emit_message(true, 'a', '1');
+	CHECKPOINT;
+));
+$node_p->safe_psql($db1, qq(
+	SELECT *
+	FROM pg_logical_slot_get_binary_changes('$fslotname', NULL, NULL,
+		'proto_version', '1',
+		'publication_names', 'dummy',
+		'messages', 'true');
+));
 # Wait for the standby to catch up so that the standby is not lagging behind
 # the failover slot.
 $node_p->wait_for_replay_catchup($node_s);