diff --git a/arch/ia64/mm/Makefile b/arch/ia64/mm/Makefile
index 7078f67..d78d20f 100644
--- a/arch/ia64/mm/Makefile
+++ b/arch/ia64/mm/Makefile
@@ -7,6 +7,5 @@
 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
 obj-$(CONFIG_NUMA)	   += numa.o
 obj-$(CONFIG_DISCONTIGMEM) += discontig.o
-ifndef CONFIG_DISCONTIGMEM
-obj-y += contig.o
-endif
+obj-$(CONFIG_SPARSEMEM)	   += discontig.o
+obj-$(CONFIG_FLATMEM)	   += contig.o