diff --git a/lib/fast_jsonapi/object_serializer.rb b/lib/fast_jsonapi/object_serializer.rb
index c161fb6b..16eba5e9 100644
--- a/lib/fast_jsonapi/object_serializer.rb
+++ b/lib/fast_jsonapi/object_serializer.rb
@@ -131,7 +131,7 @@ def reflected_record_type
 
         @reflected_record_type ||= begin
           if self.name && self.name.end_with?('Serializer')
-            self.name.split('::').last.chomp('Serializer').underscore.to_sym
+            self.name.split('::').join('_').chomp('Serializer').underscore.to_sym
           end
         end
       end
diff --git a/spec/lib/object_serializer_spec.rb b/spec/lib/object_serializer_spec.rb
index 724795c7..a213d324 100644
--- a/spec/lib/object_serializer_spec.rb
+++ b/spec/lib/object_serializer_spec.rb
@@ -335,7 +335,7 @@ class BlahSerializer
           include FastJsonapi::ObjectSerializer
         end
       end
-      expect(V1::BlahSerializer.record_type).to be :blah
+      expect(V1::BlahSerializer.record_type).to be :v1_blah
     end
 
     it 'shouldnt set default_type for a serializer that doesnt follow convention' do