diff --git a/Gruntfile.coffee b/Gruntfile.coffee
index 89f03d9d5..818fcbbb0 100644
--- a/Gruntfile.coffee
+++ b/Gruntfile.coffee
@@ -14,8 +14,14 @@ module.exports = (grunt) ->
         'spec/stdlib/**/*.coffee'
       ]
 
+    csslint:
+      options:
+        'adjoining-classes': false
+        'fallback-colors': false
+      src: ['themes/**/*.css', 'src/**/*.css']
 
   grunt.loadNpmTasks('grunt-coffeelint')
+  grunt.loadNpmTasks('grunt-contrib-csslint')
 
-  grunt.registerTask('lint', ['coffeelint:src', 'coffeelint:test'])
+  grunt.registerTask('lint', ['coffeelint:src', 'coffeelint:test', 'csslint:src'])
   grunt.registerTask('default', 'lint')
diff --git a/package.json b/package.json
index 4735ec05b..05af5bc66 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,8 @@
     "grunt-coffeelint": "0.0.6"
   },
   "devDependencies": {
-    "biscotto": "0.0.11"
+    "biscotto": "0.0.11",
+    "grunt-contrib-csslint": "~0.1.2"
   },
   "private": true,
   "scripts": {