diff --git a/src/SerializedValidation.h b/src/SerializedValidation.h
index dddd1fdce..5886b6dbb 100644
--- a/src/SerializedValidation.h
+++ b/src/SerializedValidation.h
@@ -13,7 +13,8 @@ protected:
 	void setNode();
 
 public:
-	typedef boost::shared_ptr<SerializedValidation> pointer;
+	typedef boost::shared_ptr<SerializedValidation>			pointer;
+	typedef const boost::shared_ptr<SerializedValidation>&	ref;
 
 	static SOElement	sValidationFormat[16];
 	static const uint32	sFullFlag;