diff --git a/mm/Makefile b/mm/Makefile
index 4cd69e3..2fa6d2c 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -18,5 +18,5 @@
 obj-$(CONFIG_SPARSEMEM)	+= sparse.o
 obj-$(CONFIG_SHMEM) += shmem.o
 obj-$(CONFIG_TINY_SHMEM) += tiny-shmem.o
-
+obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
 obj-$(CONFIG_FS_XIP) += filemap_xip.o