diff --git a/lib/exceptions.json b/lib/exceptions.json
index f1f83d74e..dc69eb473 100644
--- a/lib/exceptions.json
+++ b/lib/exceptions.json
@@ -1,10 +1,5 @@
 {
   ".*": [
-    {
-      "rule": "validation.css",
-      "type": "generator.unrecognize",
-      "source": "https://www.w3.org/2016/01/base.css"
-    },
     {
       "rule": "validation.css",
       "type": "generator.unrecognize",