diff --git a/Makefile b/Makefile
index 15ce648..021bbac 100644
--- a/Makefile
+++ b/Makefile
@@ -233,7 +233,7 @@ docker-login:
 	docker login
 
 docker-login-ci:
-	docker login -u $DOCKER_USER -p $DOCKER_PASS
+	docker login -u $(DOCKER_USER) -p $(DOCKER_PASS)
 
 docker-build:
 	docker build --build-arg VERSION=$(VERSION) --build-arg MAINTAINER=$(MAINTAINER) -t cointop/cointop .