diff --git a/lib/inherited_resources/class_methods.rb b/lib/inherited_resources/class_methods.rb
index 5483dc5b..2a79f0e0 100644
--- a/lib/inherited_resources/class_methods.rb
+++ b/lib/inherited_resources/class_methods.rb
@@ -368,7 +368,7 @@ def initialize_resources_class_accessors! #:nodoc:
         namespaces.delete_if do |namespace|
           begin
             "#{namespace}/engine".camelize.constantize.isolated?
-          rescue
+          rescue LoadError, NoMethodError
             false
           end
         end