diff --git a/contrib/pg_upgrade/check.c b/contrib/pg_upgrade/check.c
index c89b2dfd0fd..f2dcc0483da 100644
--- a/contrib/pg_upgrade/check.c
+++ b/contrib/pg_upgrade/check.c
@@ -30,7 +30,8 @@ static void get_bin_version(ClusterInfo *cluster);
  * such as is suitable for arguments to builtin commands 
  * like RMDIR and DEL.
  */
-static char *fix_path_separator(char *path)
+static char *
+fix_path_separator(char *path)
 {
 #ifdef WIN32