diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index d944516..127d2d1 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -225,6 +225,7 @@
 unifdef-y += if_frad.h
 unifdef-y += if_ltalk.h
 unifdef-y += if_link.h
+unifdef-y += if_pppol2tp.h
 unifdef-y += if_pppox.h
 unifdef-y += if_shaper.h
 unifdef-y += if_tr.h