diff --git a/lib/clearbit/resource.rb b/lib/clearbit/resource.rb
index <HASH>..<HASH> 100644
--- a/lib/clearbit/resource.rb
+++ b/lib/clearbit/resource.rb
@@ -18,7 +18,7 @@ module Clearbit
       @options ||= {}
       @options.merge!(value) if value
 
-      if superclass.respond_to?(:options)
+      if superclass <= Resource && superclass.respond_to?(:options)
         Nestful::Helpers.deep_merge(superclass.options, @options)
       else
         @options
Explicit superclass check to avoid conflict with Rack Test