diff --git a/Makefile b/Makefile
index dc07c9b..08ab926 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,9 @@ $(O)/.config:
 		O=$(O) \
 		$(DEFCONFIG)
 
+.PHONY: update-config
+update-config:
+	$(MAKE) -C $(O) $(DEFCONFIG)
 
 %:
 	$(MAKE) -C $(O) $@