diff --git a/lib/wash_out/type.rb b/lib/wash_out/type.rb
index 07ef6578..f4679d38 100644
--- a/lib/wash_out/type.rb
+++ b/lib/wash_out/type.rb
@@ -14,7 +14,7 @@ def self.wash_out_param_map
     end
 
     def self.wash_out_param_name
-      @param_type_name ||= name.underscore
+      @param_type_name ||= name.gsub( '/', '.').underscore
 
       if WashOut::Engine.camelize_wsdl.to_s == 'lower'
         @param_type_name = @param_type_name.camelize(:lower)