diff --git a/contrib/pg_test_fsync/pg_test_fsync.c b/contrib/pg_test_fsync/pg_test_fsync.c
index 305b3d0723ddf23014d56b87c0e4aa2ab3afd6a0..2b2e292022a3675255c3caab4bdf894ea9ca309b 100644
--- a/contrib/pg_test_fsync/pg_test_fsync.c
+++ b/contrib/pg_test_fsync/pg_test_fsync.c
@@ -359,9 +359,11 @@ test_open_syncs(void)
 static void
 test_open_sync(const char *msg, int writes_size)
 {
+#ifdef OPEN_SYNC_FLAG
 	int			tmpfile,
 				ops,
 				writes;
+#endif
 
 	printf(LABEL_FORMAT, msg);
 	fflush(stdout);