diff --git a/include/mtd/Kbuild b/include/mtd/Kbuild
index f2f210f..e0fe92b 100644
--- a/include/mtd/Kbuild
+++ b/include/mtd/Kbuild
@@ -1 +1,5 @@
-header-y := inftl-user.h jffs2-user.h mtd-abi.h mtd-user.h nftl-user.h
+header-y += inftl-user.h
+header-y += jffs2-user.h
+header-y += mtd-abi.h
+header-y += mtd-user.h
+header-y += nftl-user.h