diff --git a/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/Makefile b/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/Makefile
index c4f555e0d7..51be8f355f 100644
--- a/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/Makefile
+++ b/linux-2.6-xen-sparse/arch/xen/x86_64/kernel/Makefile
@@ -44,7 +44,7 @@ obj-$(CONFIG_X86_PM_TIMER)	+= pmtimer.o
 
 c-obj-$(CONFIG_MODULES)		+= module.o
 
-#obj-y				+= topology.o
+obj-y				+= topology.o
 c-obj-y				+= intel_cacheinfo.o
 
 bootflag-y			+= ../../../i386/kernel/bootflag.o