--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -197,7 +197,7 @@ module.exports = function(grunt) {
                 src: ['*/**/*.scss']
             },
             css: {
-                src: ['*/**/*.css'],
+                src: ['*/**/*.css', '!local/codechecker/**/*.css'],
                 options: {
                     configOverrides: {
                         rules: {