diff --git a/lib/factory_girl/proxy/stub.rb b/lib/factory_girl/proxy/stub.rb
index 65eafeda1..394057628 100644
--- a/lib/factory_girl/proxy/stub.rb
+++ b/lib/factory_girl/proxy/stub.rb
@@ -42,10 +42,6 @@ def update_attribute(*args)
         end
       end
 
-      def next_id
-        @@next_id += 1
-      end
-
       def get(attribute)
         if @ignored_attributes.has_key?(attribute)
           @ignored_attributes[attribute]
@@ -67,6 +63,12 @@ def result(to_create)
         run_callbacks(:after_stub)
         @instance
       end
+
+      private
+
+      def next_id
+        @@next_id += 1
+      end
     end
   end
 end