diff --git a/lib/userstamp/migration_helper.rb b/lib/userstamp/migration_helper.rb
index 1ff636e..6bebf8c 100644
--- a/lib/userstamp/migration_helper.rb
+++ b/lib/userstamp/migration_helper.rb
@@ -16,4 +16,6 @@ def userstamps(include_deleted_by = false)
   end
 end
 
+# ActiveRecord::ConnectionAdapters::Table.send(:include, Ddb::Userstamp::MigrationHelper)
+ActiveRecord::ConnectionAdapters::TableDefinition.send(:include, Ddb::Userstamp::MigrationHelper)
 ActiveRecord::ConnectionAdapters::Table.send(:include, Ddb::Userstamp::MigrationHelper)
diff --git a/lib/userstamp/stampable.rb b/lib/userstamp/stampable.rb
index f76fdd7..fb44889 100644
--- a/lib/userstamp/stampable.rb
+++ b/lib/userstamp/stampable.rb
@@ -111,7 +111,7 @@ def without_stamps
         end
 
         def stamper_class #:nodoc:
-          stamper_class_name.to_s.capitalize.constantize rescue nil
+          stamper_class_name.to_s.camelize.constantize rescue nil
         end
       end
 
@@ -148,4 +148,5 @@ def set_deleter_attribute
   end
 end
 
-ActiveRecord::Base.send(:include, Ddb::Userstamp::Stampable) if defined?(ActiveRecord)
\ No newline at end of file
+ActiveRecord::Base.send(:include, Ddb::Userstamp::Stampable) if defined?(ActiveRecord)
+