diff --git a/lib/atom-beautify.js b/lib/atom-beautify.js
index e79ff15..4faaf08 100644
--- a/lib/atom-beautify.js
+++ b/lib/atom-beautify.js
@@ -34,6 +34,8 @@ function beautify() {
     case 'CSS':
       text = beautifyCSS(text, beautifyOptions);
       break;
+    default:
+      return;
   }
 
   if (isSelection) {