diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index b7d81b2a9041..54a4cfb50ed0 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -92,7 +92,6 @@ header-y += if_slip.h
 header-y += if_strip.h
 header-y += if_tun.h
 header-y += if_tunnel.h
-header-y += in6.h
 header-y += in_route.h
 header-y += ioctl.h
 header-y += ip6_tunnel.h
@@ -236,6 +235,7 @@ unifdef-y += if_vlan.h
 unifdef-y += igmp.h
 unifdef-y += inet_diag.h
 unifdef-y += in.h
+unifdef-y += in6.h
 unifdef-y += inotify.h
 unifdef-y += input.h
 unifdef-y += ip.h