@@ -12,11 +12,15 @@
 #import "OFDictionary.h"
 
 /**
  * The OFMutableDictionary class is a class for using mutable hash tables.
  */
-@interface OFMutableDictionary: OFDictionary {}
+@interface OFMutableDictionary: OFDictionary
+{
+	unsigned long mutations;
+}
+
 /**
  * Sets a key to an object. A key can be any object.
  *
  * \param key The key to set
  * \param obj The object to set the key to