diff --git a/board/impa7/Makefile b/board/impa7/Makefile
index 4cb13b7..79b12a2 100644
--- a/board/impa7/Makefile
+++ b/board/impa7/Makefile
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= $(obj)lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).o
 
 COBJS	:= impa7.o flash.o
 SOBJS	:= lowlevel_init.o
@@ -33,7 +33,7 @@
 SOBJS	:= $(addprefix $(obj),$(SOBJS))
 
 $(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(AR) $(ARFLAGS) $@ $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
 
 clean:
 	rm -f $(SOBJS) $(OBJS)