diff --git a/activerecord/test/models/auto_id.rb b/activerecord/test/models/auto_id.rb
index b92619f2de..82c6544bd5 100644
--- a/activerecord/test/models/auto_id.rb
+++ b/activerecord/test/models/auto_id.rb
@@ -1,4 +1,4 @@
 class AutoId < ActiveRecord::Base
   self.table_name = "auto_id_tests"
-  self.primary_key = "auto_id" 
+  self.primary_key = "auto_id"
 end