diff --git a/lib/patches/active_record/rails7_1/serialization.rb b/lib/patches/active_record/rails7_1/serialization.rb
index fb3ac6fa..029dd93c 100644
--- a/lib/patches/active_record/rails7_1/serialization.rb
+++ b/lib/patches/active_record/rails7_1/serialization.rb
@@ -5,7 +5,7 @@ def serialize(attr_name, class_name_or_coder = Object, **options)
         if class_name_or_coder == ::JSON || [:load, :dump].all? { |x| class_name_or_coder.respond_to?(x) }
           options = options.merge(coder: class_name_or_coder, type: Object)
         else
-          options = options.merge(type: class_name_or_coder)
+          options = options.merge(code: default_column_serializer, type: class_name_or_coder)
         end
 
         super(attr_name, **options)