diff --git a/spec/cancan/rule_spec.rb b/spec/cancan/rule_spec.rb
index 42f67af..0fba0ed 100644
--- a/spec/cancan/rule_spec.rb
+++ b/spec/cancan/rule_spec.rb
@@ -1,4 +1,5 @@
 require "spec_helper"
+require "ostruct" # for OpenStruct below
 
 # Most of Rule functionality is tested in Ability specs
 describe CanCan::Rule do