diff --git a/sys/boot/i386/cdboot/Makefile b/sys/boot/i386/cdboot/Makefile
index fe370bc2a9d4..f352d693b658 100644
--- a/sys/boot/i386/cdboot/Makefile
+++ b/sys/boot/i386/cdboot/Makefile
@@ -1,15 +1,19 @@
 # $FreeBSD$
 
 PROG=	cdboot
 STRIP=
 BINMODE=${NOBINMODE}
 NO_MAN=
 SRCS=	${PROG}.S
 
 CFLAGS+=-I${.CURDIR}/../common
 
 ORG=	0x7c00
 
 LDFLAGS=-e start -Ttext ${ORG} -Wl,-N,-S,--oformat,binary
 
 .include <bsd.prog.mk>
+
+# XXX: clang integrated-as doesn't grok .codeNN directives yet
+CFLAGS.cdboot.S=	${CLANG_NO_IAS}
+CFLAGS+=		${CFLAGS.${.IMPSRC:T}}