diff --git a/lib/active_model_serializers/test.rb b/lib/active_model_serializers/test.rb
index 77f0b702..4f539a44 100644
--- a/lib/active_model_serializers/test.rb
+++ b/lib/active_model_serializers/test.rb
@@ -1,5 +1,6 @@
 module ActiveModelSerializers
   module Test
-    autoload :Serializer, 'active_model_serializers/test/serializer'
+    extend ActiveSupport::Autoload
+    autoload :Serializer
   end
 end