diff --git a/sys/dev/aic7xxx/aicasm/Makefile b/sys/dev/aic7xxx/aicasm/Makefile
index 78701b0068e..222c96a717e 100644
--- a/sys/dev/aic7xxx/aicasm/Makefile
+++ b/sys/dev/aic7xxx/aicasm/Makefile
@@ -15,6 +15,7 @@ SRCS=	${GENHDRS} ${CSRCS} ${YSRCS} ${LSRCS}
 CLEANFILES+= ${GENHDRS} ${YSRCS:R:C/(.*)/\1.output/g}
 DPADD=	${LIBL}
 LDADD=	-ll
+WARNS?=	6
 
 # Correct path for kernel builds
 # Don't rely on the kernel's .depend file