diff --git a/libc/kernel/uapi/linux/mroute6.h b/libc/kernel/uapi/linux/mroute6.h
index c73765c..68480de 100644
--- a/libc/kernel/uapi/linux/mroute6.h
+++ b/libc/kernel/uapi/linux/mroute6.h
@@ -93,6 +93,7 @@
 #define MRT6MSG_NOCACHE 1
 #define MRT6MSG_WRONGMIF 2
 #define MRT6MSG_WHOLEPKT 3
+#define MRT6MSG_WRMIFWHOLE 4
   __u8 im6_mbz;
   __u8 im6_msgtype;
   __u16 im6_mif;