@@ -18,10 +18,14 @@
 
 /**
  * \brief An mutable unordered set of unique objects.
  */
 @interface OFMutableSet: OFSet
+{
+	unsigned long mutations;
+}
+
 /**
  * \brief Adds the specified object to the set.
  *
  * \param object The object to add to the set
  */