diff --git a/contrib/pg_upgrade/file.c b/contrib/pg_upgrade/file.c
index c7b6f5cbfa..d3b0eaf2e2 100644
--- a/contrib/pg_upgrade/file.c
+++ b/contrib/pg_upgrade/file.c
@@ -296,7 +296,7 @@ pg_scandir_internal(const char *dirname,
 	while ((direntry = readdir(dirdesc)) != NULL)
 	{
 		/* Invoke the selector function to see if the direntry matches */
-		if ((*selector) (direntry))
+		if (selector && (*selector) (direntry))
 		{
 			count++;