diff --git a/sys/modules/hyperv/vmbus/Makefile b/sys/modules/hyperv/vmbus/Makefile
index 944bf75b0e7..435fcc0da37 100644
--- a/sys/modules/hyperv/vmbus/Makefile
+++ b/sys/modules/hyperv/vmbus/Makefile
@@ -13,6 +13,7 @@ SRCS=	hyperv.c \
 	vmbus_et.c \
 	vmbus_if.c \
 	vmbus_res.c \
+	vmbus_vector.S \
 	vmbus_xact.c
 SRCS+=	acpi_if.h bus_if.h device_if.h opt_acpi.h pci_if.h pcib_if.h vmbus_if.h
 
@@ -22,8 +23,7 @@ SRCS+=  opt_kstack_pages.h opt_nfs.h opt_hwpmc_hooks.h opt_compat.h
 SRCS+=	opt_apic.h
 .endif
 
-SRCS+=	assym.s \
-	vmbus_vector.S
+DPSRCS+=	assym.s
 
 vmbus_vector.o:
 	${CC} -c -x assembler-with-cpp -DLOCORE ${CFLAGS} \