diff --git a/sys/arch/i386/stand/cdboot/Makefile b/sys/arch/i386/stand/cdboot/Makefile
index 7fe141fdd..4062fded0 100644
--- a/sys/arch/i386/stand/cdboot/Makefile
+++ b/sys/arch/i386/stand/cdboot/Makefile
@@ -36,6 +36,8 @@ LDFLAGS+=	-Wl,-m,elf_i386
 AFLAGS+=	-m32
 .endif
 
+AFLAGS+=	-Wa,--divide
+
 BUILDSYMLINKS+=	$S/arch/i386/include	machine \
 		$S/arch/x86/include	x86