diff --git a/test/unit/user_test.rb b/test/unit/user_test.rb
index 738bd7768..bb325165d 100644
--- a/test/unit/user_test.rb
+++ b/test/unit/user_test.rb
@@ -483,7 +483,7 @@ class UserTest < ActiveSupport::TestCase
       context "on the fly registration" do
         setup do
           @auth_source = AuthSourceLdap.find(1)
-          @auth.update_attribute :onthefly_register, true
+          @auth_source.update_attribute :onthefly_register, true
         end
 
         context "with a successful authentication" do