diff --git a/libc/kernel/uapi/linux/mctp.h b/libc/kernel/uapi/linux/mctp.h
index 8920339..0057842 100644
--- a/libc/kernel/uapi/linux/mctp.h
+++ b/libc/kernel/uapi/linux/mctp.h
@@ -38,9 +38,18 @@
 #define MCTP_OPT_ADDR_EXT 1
 #define SIOCMCTPALLOCTAG (SIOCPROTOPRIVATE + 0)
 #define SIOCMCTPDROPTAG (SIOCPROTOPRIVATE + 1)
+#define SIOCMCTPALLOCTAG2 (SIOCPROTOPRIVATE + 2)
+#define SIOCMCTPDROPTAG2 (SIOCPROTOPRIVATE + 3)
 struct mctp_ioc_tag_ctl {
   mctp_eid_t peer_addr;
   __u8 tag;
   __u16 flags;
 };
+struct mctp_ioc_tag_ctl2 {
+  unsigned int net;
+  mctp_eid_t peer_addr;
+  mctp_eid_t local_addr;
+  __u16 flags;
+  __u8 tag;
+};
 #endif