diff --git a/mm/Makefile b/mm/Makefile
index b3c6ce9..580cd3f 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -71,3 +71,4 @@
 obj-$(CONFIG_GENERIC_EARLY_IOREMAP) += early_ioremap.o
 obj-$(CONFIG_CMA)	+= cma.o
 obj-$(CONFIG_MEMORY_BALLOON) += balloon_compaction.o
+obj-$(CONFIG_PAGE_EXTENSION) += page_ext.o