diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index 059dc8cff3..e0cde4f7f3 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -12,7 +12,7 @@ require 'models/contact'
 require 'models/keyboard'
 
 class AttributeMethodsTest < ActiveRecord::TestCase
-  include InTimeZome
+  include InTimeZone
 
   fixtures :topics, :developers, :companies, :computers
 
diff --git a/activerecord/test/cases/dirty_test.rb b/activerecord/test/cases/dirty_test.rb
index ac1ab801da..d4fc5f204b 100644
--- a/activerecord/test/cases/dirty_test.rb
+++ b/activerecord/test/cases/dirty_test.rb
@@ -27,7 +27,7 @@ class NumericData < ActiveRecord::Base
 end
 
 class DirtyTest < ActiveRecord::TestCase
-  include InTimeZome
+  include InTimeZone
 
   # Dummy to force column loads so query counts are clean.
   def setup
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index cb1edc4627..1bff005510 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -135,7 +135,9 @@ module LogIntercepter
   end
 end
 
-module InTimeZome
+module InTimeZone
+  private
+
   def in_time_zone(zone)
     old_zone  = Time.zone
     old_tz    = ActiveRecord::Base.time_zone_aware_attributes