diff --git a/sys/modules/digi/digi/Makefile b/sys/modules/digi/digi/Makefile
index 5a6dfc20dd57..5737af536f05 100644
--- a/sys/modules/digi/digi/Makefile
+++ b/sys/modules/digi/digi/Makefile
@@ -5,5 +5,9 @@ KMOD=	digi
 SRCS=	digi.c digi_pci.c digi_isa.c
 SRCS+=	digi.h digi_pci.h digireg.h digi_mod.h
 SRCS+=	bus_if.h pci_if.h device_if.h
+SRCS+=	opt_compat.h
+
+opt_compat.h:
+	echo "#define COMPAT_43 1" > opt_compat.h
 
 .include <bsd.kmod.mk>
diff --git a/sys/modules/rp/Makefile b/sys/modules/rp/Makefile
index de964eec5014..cff6e12dad00 100644
--- a/sys/modules/rp/Makefile
+++ b/sys/modules/rp/Makefile
@@ -3,6 +3,9 @@
 .PATH: ${.CURDIR}/../../dev/rp
 
 KMOD=	rp
-SRCS=	rp.c rp_pci.c device_if.h bus_if.h pci_if.h
+SRCS=	rp.c rp_pci.c device_if.h bus_if.h pci_if.h opt_compat.h
+
+opt_compat.h:
+	echo "#define COMPAT_43 1" > opt_compat.h
 
 .include <bsd.kmod.mk>