diff --git a/lib/has_many_polymorphs/railtie.rb b/lib/has_many_polymorphs/railtie.rb
index 6633512..f16f901 100644
--- a/lib/has_many_polymorphs/railtie.rb
+++ b/lib/has_many_polymorphs/railtie.rb
@@ -3,7 +3,7 @@ class Railtie < Rails::Railtie
     initializer "has_many_polymorphs" do |app|
       require 'has_many_polymorphs/autoload'
       if defined?(Spork)
-        Spork.trap_class_methods(HasManyPolymorphs, :setup)
+        Spork.trap_class_method(HasManyPolymorphs, :setup)
       end
       HasManyPolymorphs.setup
     end