diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 8f4ecbd33..b05b96e45 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -334,7 +334,9 @@ int conf_write(const char *name)
 	struct symbol *sym;
 	struct menu *menu;
 	const char *basename;
-	char dirname[128], tmpname[128], newname[128];
+	char dirname[128];
+	char tmpname[256];
+	char newname[256];
 	int type, l;
 	const char *str;
 	time_t now;