diff --git a/boards/Board.mk b/boards/Board.mk
index a4edbc78e22..cefae185862 100644
--- a/boards/Board.mk
+++ b/boards/Board.mk
@@ -49,6 +49,7 @@ $(RCOBJS): $(ETCDIR)$(DELIM)%: %
 
 $(ETCSRC): $(RCRAWS) $(RCOBJS)
 	$(foreach raw, $(RCRAWS), \
+	  $(shell rm -rf $(ETCDIR)$(DELIM)$(raw)) \
 	  $(shell mkdir -p $(dir $(ETCDIR)$(DELIM)$(raw))) \
 	  $(shell cp -rfp $(raw) $(ETCDIR)$(DELIM)$(raw)))
 	$(Q) genromfs -f romfs.img -d $(ETCDIR)$(DELIM)$(CONFIG_NSH_ROMFSMOUNTPT) -V "$(basename $<)"