diff --git a/lib/common/minify.js b/lib/common/minify.js
index 387270742..64a926962 100644
--- a/lib/common/minify.js
+++ b/lib/common/minify.js
@@ -19,7 +19,7 @@ function minify(inpath, outpath, callback, options) {
   if (!outpath) {
     outpath = inpath.replace(/(?=\.js$)/, '.min');
   }
-  var output = uglify.minify(inpath, _.defaults(options, uglifyOptions));
+  var output = uglify.minify(inpath, _.defaults(options || {}, uglifyOptions));
   fs.writeFile(outpath, output.code, 'utf-8', callback);
 }