diff --git a/Makefile.include b/Makefile.include
index ee3cd797e..7ae85e8ca 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -65,13 +65,13 @@ $(ISR): $(ISR:.o=.c)
 
 
 ifdef COBJS
-BOARDARCS := $(OBJDIR)/board.a(${filter $(OBJDIR)/%.o,$(OBJDIR)/$(COBJS)})
+BOARDARCS := $(OBJDIR)/board.a(${filter $(OBJDIR)/%.o,$(BOARDOBJS)})
 endif
 empty-board-a:
 	$(AR) $(ARFLAGS) $(OBJDIR)/board.a
 .PHONY: empty-board-a
 
-$(OBJDIR)/board.a: empty-board-a $(BOARDARCS)
+$(OBJDIR)/board.a: empty-board-a $(BOARDARCS) $(BOARDOBJS)
 $(MC1322X)/src/src.a: $(MC1322X)/src/src.a($(SRCOBJS))
 
 %_$(BOARD).elf:	$(OBJDIR)/%.o $(START) $(ISR) $(SRCOBJS) $(LINKERSCRIPT) $(LIBMC1322X)/libmc1322x.a $(OBJDIR)/board.a $(MC1322X)/src/src.a