diff --git a/lib/index.js b/lib/index.js
index f83bc84..6a177b3 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -34,6 +34,8 @@ VinylLSConverter = (function(){
       return [null, file];
     } else if (file.isStream()) {
       return ["Streaming not supported", null];
+    } else if ('.js' === Path.extname(file.path)) {
+      return [null, file];
     } else {
       return this._tryConvertToJS(file.clone());
     }
diff --git a/src/index.ls b/src/index.ls
index eb82261..0841df1 100644
--- a/src/index.ls
+++ b/src/index.ls
@@ -30,6 +30,8 @@ class VinylLSConverter
       [null, file]
     else if file.isStream!
       ["Streaming not supported", null]
+    else if '.js' is Path.extname file.path
+      [null, file]
     else
       @_tryConvertToJS(file.clone!)