diff --git a/test/karma.conf.js.example b/test/karma.conf.js.example
index 7426965c49..9cc4a175be 100644
--- a/test/karma.conf.js.example
+++ b/test/karma.conf.js.example
@@ -64,6 +64,7 @@ files = [
   '../src/js/json.js',
   '../src/js/setup.js',
   '../src/js/plugins.js',
+  '../src/js/util.js',
   '../test/unit/*.js'
 ];