@@ -87,10 +87,12 @@
 		    ![data[i].key isEqual: key]; i++);
 
 	/* Key not in dictionary */
 	if (i >= size || ![data[i].key isEqual: key]) {
 		resize(self, isa, count + 1, &data, &size);
+
+		mutations++;
 
 		i = hash & (size - 1);
 		for (; i < size && data[i].key != nil; i++);
 
 		/* In case the last bucket is already used */
@@ -150,10 +152,11 @@
 	[data[i].key release];
 	[data[i].object release];
 	data[i].key = nil;
 
 	count--;
+	mutations++;
 	resize(self, isa, count, &data, &size);
 
 	return self;
 }