diff --git a/Gruntfile.js b/Gruntfile.js
index 4d1d5a2..75da245 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -83,7 +83,9 @@ module.exports = function(grunt) {
       },
       dev: {
         options: {
-          map: 'assets/css/'
+          map: {
+            prev: 'assets/css/'
+          }
         },
         src: 'assets/css/main.css'
       },
diff --git a/package.json b/package.json
index b580199..b6fb0c2 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   "devDependencies": {
     "bower": "~1.3.5",
     "grunt": "~0.4.5",
-    "grunt-autoprefixer": "~0.8.0",
+    "grunt-autoprefixer": "~0.8.1",
     "grunt-contrib-concat": "~0.4.0",
     "grunt-contrib-jshint": "~0.10.0",
     "grunt-contrib-less": "~0.11.3",