diff --git a/.eslintrc b/.eslintrc
index 78f145d1..7e363718 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -3,6 +3,7 @@
   "rules": {
     "no-useless-escape": 0,
     "prefer-const": "warn",
-    "no-unused-vars": "warn"
+    "no-unused-vars": "warn",
+    "no-undef": "warn"
   }
 }