diff --git a/app/models/user.rb b/app/models/user.rb
index a9ee471ad61..d9f420759d2 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -249,7 +249,7 @@ class User < ActiveRecord::Base
   def namespace_uniq
     namespace_name = self.username
     if Namespace.find_by(path: namespace_name)
-      self.errors.add :username, "already exist"
+      self.errors.add :username, "already exists"
     end
   end