@@ -27,11 +27,11 @@
  *
  * @note Subclasses must implement @ref characterIsMember:.
  */
 @interface OFCharacterSet: OFObject
 {
-	OF_RESERVE_IVARS(4)
+	OF_RESERVE_IVARS(OFCharacterSet, 4)
 }
 
 #ifdef OF_HAVE_CLASS_PROPERTIES
 @property (class, readonly, nonatomic) OFCharacterSet *whitespaceCharacterSet;
 #endif