Index: head/sys/modules/hyperv/vmbus/Makefile
===================================================================
--- head/sys/modules/hyperv/vmbus/Makefile
+++ head/sys/modules/hyperv/vmbus/Makefile
@@ -11,6 +11,7 @@
 	vmbus_br.c \
 	vmbus_chan.c \
 	vmbus_et.c \
+	vmbus_if.c \
 	vmbus_xact.c
 SRCS+=	acpi_if.h bus_if.h device_if.h opt_acpi.h vmbus_if.h