diff --git a/sys/modules/hyperv/pcib/Makefile b/sys/modules/hyperv/pcib/Makefile
--- a/sys/modules/hyperv/pcib/Makefile
+++ b/sys/modules/hyperv/pcib/Makefile
@@ -4,6 +4,7 @@
 KMOD=	vmbus_pcib
 SRCS=	vmbus_pcib.c
 SRCS+=	bus_if.h device_if.h pci_if.h pcib_if.h vmbus_if.h
+SRCS+=	opt_acpi.h
 
 CFLAGS+= -I${SRCTOP}/sys/dev/hyperv/pcib