diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index bcd01f269f60b61ce36fa7cb4c8c6169abf5018a..e1013156c25ed21214223950c60b9bd5a253df80 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -239,6 +239,7 @@ unifdef-y += ipc.h
 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