diff --git a/Makefile b/Makefile
index 07340ecc..bb269339 100644
--- a/Makefile
+++ b/Makefile
@@ -65,7 +65,6 @@ build: $(BUILD_DEPS)
 
 	# docker
 .PHONY: docker
-BUILD_DOCKER_PROXY=
 
 docker:
 	docker build --build-arg https_proxy=$(BUILD_DOCKER_PROXY) -t venus-market .