diff --git a/Dockerfile b/Dockerfile
index c2435f473a..8f95a82e3f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,9 @@ WORKDIR /go/src/github.com/docker/swarm
 ENV GOPATH /go/src/github.com/docker/swarm/Godeps/_workspace:$GOPATH
 RUN CGO_ENABLED=0 go install -v -a -tags netgo -ldflags "-w -X github.com/docker/swarm/version.GITCOMMIT `git rev-parse --short HEAD`"
 
+ENV SWARM_HOST :2375
 EXPOSE 2375
+
 VOLUME $HOME/.swarm
 
 ENTRYPOINT ["swarm"]