diff --git a/lib/rails_ext/active_record_has_json.rb b/lib/rails_ext/active_record_has_json.rb
index b8efd0a..7a5540b 100644
--- a/lib/rails_ext/active_record_has_json.rb
+++ b/lib/rails_ext/active_record_has_json.rb
@@ -5,7 +5,7 @@ module ActiveRecord
     end
 
     def assign_data_with_type_casting(new_data)
-      new_data.each { |key, value| self.send("#{key}=", value) }
+      new_data.each { |key, value| send("#{key}=", value) }
     end
 
     private