diff --git a/mm/Makefile b/mm/Makefile
index 9dd824c..60c56c0 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -23,4 +23,4 @@
 obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
 obj-$(CONFIG_FS_XIP) += filemap_xip.o
 obj-$(CONFIG_MIGRATION) += migrate.o
-
+obj-$(CONFIG_SMP) += allocpercpu.o