diff --git a/sys/modules/cas/Makefile b/sys/modules/cas/Makefile
index f4b41ca65aa9..8e71fcf7dc1f 100644
--- a/sys/modules/cas/Makefile
+++ b/sys/modules/cas/Makefile
@@ -3,6 +3,10 @@
 .PATH: ${.CURDIR}/../../dev/cas
 
 KMOD=	if_cas
-SRCS=	bus_if.h device_if.h if_cas.c miibus_if.h pci_if.h
+SRCS=	bus_if.h device_if.h if_cas.c miibus_if.h pci_if.h ${ofw_bus_if}
+
+.if ${MACHINE_ARCH} == "powerpc" || ${MACHINE_ARCH} == "sparc64"
+ofw_bus_if=	ofw_bus_if.h
+.endif
 
 .include <bsd.kmod.mk>