diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index bcd01f2..e101315 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -239,6 +239,7 @@
 unifdef-y += ipmi.h
 unifdef-y += ipv6.h
 unifdef-y += ipv6_route.h
+unifdef-y += ip6_tunnel.h
 unifdef-y += isdn.h
 unifdef-y += isdnif.h
 unifdef-y += isdn_divertif.h