diff --git a/Gruntfile.js b/Gruntfile.js
index 8b1301d..a3e3bc4 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -60,7 +60,7 @@ module.exports = function (grunt)
 
         exec: {
             cover: {
-                cmd: './node_modules/.bin/istanbul cover ./node_modules/.bin/grunt test'
+                cmd: './node_modules/.bin/istanbul cover ./node_modules/.bin/grunt -- test'
             },
 
             check_cover: {