diff --git a/lib/validates_timeliness/helper_methods.rb b/lib/validates_timeliness/helper_methods.rb
index 4341052..58aec52 100644
--- a/lib/validates_timeliness/helper_methods.rb
+++ b/lib/validates_timeliness/helper_methods.rb
@@ -5,7 +5,7 @@ module ValidatesTimeliness
     included do
       include ValidationMethods
       extend ValidationMethods
-      class_inheritable_accessor :timeliness_validated_attributes
+      class_inheritable_hash :timeliness_validated_attributes
       self.timeliness_validated_attributes = {}
     end
 
@@ -17,7 +17,7 @@ module ValidatesTimeliness
           validated[attr_name] = options[:type]
           validated
         }
-        timeliness_validated_attributes.update(attributes)
+        self.timeliness_validated_attributes = attributes
         validates_with Validator, options
       end
 
diff --git a/spec/validates_timeliness/helper_methods_spec.rb b/spec/validates_timeliness/helper_methods_spec.rb
index 10ba504..dd77692 100644
--- a/spec/validates_timeliness/helper_methods_spec.rb
+++ b/spec/validates_timeliness/helper_methods_spec.rb
@@ -21,8 +21,16 @@ describe ValidatesTimeliness::HelperMethods do
 
   describe ".timeliness_validated_attributes" do
     it 'should return attributes validated with plugin validator' do
+      Person.timeliness_validated_attributes = {}
       Person.validates_date :birth_date
-      Person.timeliness_validated_attributes.should == {"birth_date" => :date}
+      Person.validates_time :birth_time
+      Person.validates_datetime :birth_datetime
+
+      Person.timeliness_validated_attributes.should == {
+        "birth_date" => :date,
+        "birth_time" => :time,
+        "birth_datetime" => :datetime
+      }
     end
   end
 end