diff --git a/board/cm-bf537u/Makefile b/board/cm-bf537u/Makefile
index bad018a..4d7bf14 100644
--- a/board/cm-bf537u/Makefile
+++ b/board/cm-bf537u/Makefile
@@ -27,7 +27,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS-y	:= $(BOARD).o gpio_cfi_flash.o
 
@@ -36,7 +36,7 @@
 SOBJS	:= $(addprefix $(obj),$(SOBJS-y))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)