diff --git a/proto/Makefile b/proto/Makefile
index 76bb98baffb39ff96451297e5e0550db8c416ca0..9d291ed8bb0b30eb1a88ec78acf174bb12e904e5 100644
--- a/proto/Makefile
+++ b/proto/Makefile
@@ -1,6 +1,6 @@
 # https://sysprog21.github.io/lkmpg/
 obj-m += vmbr.o
-vmbr-objs := hypervisor.o ./msr/msr.o ./region/vmxon.o
+vmbr-objs := hypervisor.o ./msr/msr.o ./region/vmxon.o ./vcpu/vcpu.o
 
 PWD := $(CURDIR)