diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 98e0fd2..c9ccb55 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -439,6 +439,7 @@
 	NET_TCP_AVAIL_CONG_CONTROL=122,
 	NET_TCP_ALLOWED_CONG_CONTROL=123,
 	NET_TCP_MAX_SSTHRESH=124,
+	NET_TCP_FRTO_RESPONSE=125,
 };
 
 enum {