diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 8754568..76eaeff 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -402,6 +402,7 @@
 	NET_IPV4_IPFRAG_MAX_DIST=112,
  	NET_TCP_MTU_PROBING=113,
 	NET_TCP_BASE_MSS=114,
+	NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS=115,
 };
 
 enum {