diff --git a/contrib/pg_upgrade/option.c b/contrib/pg_upgrade/option.c
index 83300a9e51e..a38a9a80fff 100644
--- a/contrib/pg_upgrade/option.c
+++ b/contrib/pg_upgrade/option.c
@@ -46,7 +46,7 @@ parseCommandLine(migratorContext *ctx, int argc, char *argv[])
 		{"verbose", no_argument, NULL, 'v'},
 		{NULL, 0, NULL, 0}
 	};
-	char		option;			/* Command line option */
+	int			option;			/* Command line option */
 	int			optindex = 0;	/* used by getopt_long */
 	int			user_id;