diff --git a/libc/kernel/uapi/linux/gtp.h b/libc/kernel/uapi/linux/gtp.h
index 3b9416e..20bc3d6 100644
--- a/libc/kernel/uapi/linux/gtp.h
+++ b/libc/kernel/uapi/linux/gtp.h
@@ -23,6 +23,7 @@
   GTP_CMD_NEWPDP,
   GTP_CMD_DELPDP,
   GTP_CMD_GETPDP,
+  GTP_CMD_ECHOREQ,
   GTP_CMD_MAX,
 };
 enum gtp_version {