diff --git a/mm/Makefile b/mm/Makefile
index 8f70ffd..4cd69e3 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -19,3 +19,4 @@
 obj-$(CONFIG_SHMEM) += shmem.o
 obj-$(CONFIG_TINY_SHMEM) += tiny-shmem.o
 
+obj-$(CONFIG_FS_XIP) += filemap_xip.o