diff --git a/sys/arch/atari/stand/installboot/Makefile b/sys/arch/atari/stand/installboot/Makefile
index a8ca74a7b350..b73f58445c31 100644
--- a/sys/arch/atari/stand/installboot/Makefile
+++ b/sys/arch/atari/stand/installboot/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.6 2011/11/01 13:19:53 chs Exp $
+#	$NetBSD: Makefile,v 1.7 2014/11/24 07:52:04 tsutsui Exp $
 
 WARNS=	4
 PROG=	installboot
@@ -7,4 +7,7 @@ SRCS=	installboot.c disklabel.c
 BINDIR=	/usr/mdec
 LDADD=	-lkvm
 
+# XXX needs proper struct or union to calculate boot sector uint16_t cksums
+CFLAGS+=	-fno-strict-aliasing
+
 .include <bsd.prog.mk>