diff --git a/lib/common/minify.js b/lib/common/minify.js
index cf30679be..387270742 100644
--- a/lib/common/minify.js
+++ b/lib/common/minify.js
@@ -9,9 +9,12 @@ var uglifyOptions = require('./uglify.options.js');
 /*----------------------------------------------------------------------------*/
 
 function minify(inpath, outpath, callback, options) {
-  if (typeof outpath == 'function') {
+  if (_.isFunction(outpath)) {
+    if (_.isObject(callback)) {
+      options = callback;
+    }
+    callback = outpath;
     outpath = undefined;
-    callback = options;
   }
   if (!outpath) {
     outpath = inpath.replace(/(?=\.js$)/, '.min');