diff --git a/board/bmw/Makefile b/board/bmw/Makefile
index ac85cc3..4f88efa 100644
--- a/board/bmw/Makefile
+++ b/board/bmw/Makefile
@@ -27,7 +27,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	= $(BOARD).o flash.o ns16550.o serial.o m48t59y.o
 
@@ -38,7 +38,7 @@
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
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