diff --git a/lib/app/middleware/mojito-combo-handler.js b/lib/app/middleware/mojito-combo-handler.js
index 9fb05396b..d6fe71e8c 100644
--- a/lib/app/middleware/mojito-combo-handler.js
+++ b/lib/app/middleware/mojito-combo-handler.js
@@ -49,7 +49,7 @@ var libfs = require('fs'),
 
     REGEX_LANG_TOKEN = /\"\{langToken\}\"/g,
     REGEX_LANG_PATH  = /\{langPath\}/g,
-    REGEX_LOCALE     = /\_([a-z]{2}-[A-Z]{2})$/,
+    REGEX_LOCALE     = /\_([a-z]{2}(-[A-Z]{2})?)$/,
 
     DEFAULT_HEADERS = {
         '.js': {