diff --git a/util/reserved-domains.json b/util/reserved-domains.json
index 1f01c28c58..3ab05bd6ca 100644
--- a/util/reserved-domains.json
+++ b/util/reserved-domains.json
@@ -78,6 +78,7 @@
     "recovery",
     "redirect",
     "register",
+    "registrar",
     "registry",
     "reset",
     "reset-password",
@@ -106,7 +107,6 @@
     "tld",
     "token",
     "tokens",
-    "undefined",
     "url",
     "url[1-9999]",
     "user",