diff --git a/dev/utils.js b/dev/utils.js
index 16afa3a9..9b904ab9 100644
--- a/dev/utils.js
+++ b/dev/utils.js
@@ -18,7 +18,7 @@ module.exports = {
 					} else if (/null/.test(match)) {
 						cls = "null";
 					}
-					return "<span class="" + cls + "">" + match + "</span>";
+					return "<span class=" + cls + ">" + match + "</span>";
 				});
 			}
 		}
diff --git a/package.json b/package.json
index e0eb5826..ecdb9714 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "e2e": "node test/e2e/runner.js",
     "pretest": "npm run lint",
     "test": "npm run unit",
-    "ci": "karma start test/unit/karma.conf.js --auto-watch --no-single-run --reporters=dots"
+    "ci": "karma start test/unit/karma.conf.js --auto-watch --no-single-run --reporters=dots --port=9877"
   },
   "keywords": [
     "vue",