diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 2fc8e14cc24a8b6ce36a39d4d929539d38a5710e..9aa9bcadf869ac5948e712532de794a52f52f529 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -276,6 +276,7 @@ ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/kvm_para.h \
 		  $(srctree)/include/asm-$(SRCARCH)/kvm_para.h),)
 unifdef-y += kvm_para.h
 endif
+unifdef-y += l2tp.h
 unifdef-y += llc.h
 unifdef-y += loop.h
 unifdef-y += lp.h