@@ -28,10 +28,11 @@
  */
 @interface OFMethodSignature: OFObject
 {
 	char *_types;
 	OFMutableData *_typesPointers, *_offsets;
+	OF_RESERVE_IVARS(4)
 }
 
 /*!
  * @brief The number of arguments of the method.
  */