diff --git a/Makefile b/Makefile
index c546fa8..24ef08f 100644
--- a/Makefile
+++ b/Makefile
@@ -39,13 +39,13 @@ else
 include $(SMING_HOME)/Makefile-project.mk
 endif
 
-$(APP_AR): $(OBJ)
-	$(vecho) "AR $@"
-
+# Add BUILD_ID versioning
+$(APP_AR): $(BUILD_BASE)/ver.o
+OBJ += $(BUILD_BASE)/ver.o
+$(BUILD_BASE)/ver.o:
 	@echo "char* BUILD_ID = \"$(shell git rev-parse --short HEAD)-$(shell TZ=UTC date +%Y%m%d-%H%M%S)\";" > $(BUILD_BASE)/ver.c
 	$(Q) $(CC) -c $(BUILD_BASE)/ver.c -o $(BUILD_BASE)/ver.o
 
-	$(Q) $(AR) cru $@ $^ $(BUILD_BASE)/ver.o
 
 ota: all
 	-mkdir ../master/ota/$(DEVICE) >/dev/null