@@ -31,10 +31,11 @@
 @interface OFInvocation: OFObject
 {
 	OFMethodSignature *_methodSignature;
 	OFMutableArray OF_GENERIC(OFMutableData *) *_arguments;
 	OFMutableData *_returnValue;
+	OF_RESERVE_IVARS(4)
 }
 
 /*!
  * @brief The method signature for the invocation.
  */