@@ -22,8 +22,11 @@
  *	  OFInvalidArgumentException.h ObjFW/OFInvalidArgumentException.h
  *
  * @brief An exception indicating that the argument is invalid for this method.
  */
 @interface OFInvalidArgumentException: OFException
+{
+	OF_RESERVE_IVARS(OFInvalidArgumentException, 4)
+}
 @end
 
 OF_ASSUME_NONNULL_END