diff --git a/board/adder/Makefile b/board/adder/Makefile
index d0223b5..b2ffd28 100644
--- a/board/adder/Makefile
+++ b/board/adder/Makefile
@@ -35,7 +35,7 @@
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS)
-	$(AR) crv $@ $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
 
 clean:
 	rm -f $(SOBJS) $(OBJS)