1 files changed, 12 insertions, 6 deletions
diff --git a/activerecord/lib/active_record/type/serialized.rb b/activerecord/lib/active_record/type/serialized.rb
index 4ff0740cfb..ca12c83b1a 100644
--- a/activerecord/lib/active_record/type/serialized.rb
+++ b/activerecord/lib/active_record/type/serialized.rb
@@ -1,7 +1,7 @@
 module ActiveRecord
   module Type
-    class Serialized < DelegateClass(ActiveModel::Type::Value) # :nodoc:
-      include ActiveModel::Type::Helpers::Mutable
+    class Serialized < DelegateClass(Type::Value) # :nodoc:
+      include Type::Helpers::Mutable
 
       attr_reader :subtype, :coder
 
@@ -32,7 +32,7 @@ module ActiveRecord
 
       def changed_in_place?(raw_old_value, value)
         return false if value.nil?
-        raw_new_value = serialize(value)
+        raw_new_value = encoded(value)
         raw_old_value.nil? != raw_new_value.nil? ||
           subtype.changed_in_place?(raw_old_value, raw_new_value)
       end
@@ -49,9 +49,15 @@ module ActiveRecord
 
       private
 
-      def default_value?(value)
-        value == coder.load(nil)
-      end
+        def default_value?(value)
+          value == coder.load(nil)
+        end
+
+        def encoded(value)
+          unless default_value?(value)
+            coder.dump(value)
+          end
+        end
     end
   end
 end