diff --git a/Makefile.include b/Makefile.include
index 16e42dc2e..84bb5c012 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -57,7 +57,9 @@ $(ISR): $(ISR:.o=.c)
 	$(CC) $(CFLAGS) $(ARM_FLAGS) -MMD $< -c -o $@
 	@$(FINALIZE_DEPENDENCY)
 
-$(OBJDIR)/board.a: $(OBJDIR)/board.a($(OBJDIR)/$(COBJS))
+empty-board-a:
+	$(AR) $(ARFLAGS) $(OBJDIR)/board.a
+$(OBJDIR)/board.a: empty-board-a $(filter $(OBJDIR)/%.o, $(OBJDIR)/board.a($(OBJDIR)/$(COBJS)))
 $(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
diff --git a/config.mk b/config.mk
index a6156ec45..1b13d3667 100644
--- a/config.mk
+++ b/config.mk
@@ -24,6 +24,7 @@ DBGFLAGS= -g -DDEBUG
 OPTFLAGS= -Os #-fomit-frame-pointer
 LDSCRIPT := boot.lds
 OBJCFLAGS += --gap-fill=0xff
+ARFLAGS = cru
 
 gccincdir := $(shell $(CC) -print-file-name=include)