diff --git a/app/validators/namespace_validator.rb b/app/validators/namespace_validator.rb
index 4dc3b2ab9a0..2821ecf0a88 100644
--- a/app/validators/namespace_validator.rb
+++ b/app/validators/namespace_validator.rb
@@ -24,6 +24,7 @@ class NamespaceValidator < ActiveModel::EachValidator
     projects
     public
     repository
+    robots.txt
     s
     search
     services