diff --git a/build-tools/README.md b/build-tools/README.md
index e3d17d0b846..de9768bf40f 100644
--- a/build-tools/README.md
+++ b/build-tools/README.md
@@ -82,10 +82,10 @@ docker-machine create \
 eval $(docker-machine env ${KUBE_BUILD_VM})
 
 # Pin down the port that rsync will be exposed on on the remote machine
-export KUBE_RSYNC_PORT=8370
+export KUBE_RSYNC_PORT=8730
 
 # forward local 8730 to that machine so that rsync works
-docker-machine ssh ${KUBE_BUILD_VM} -L ${KUBE_RSYNC_PORT}:localhost:8730 -N &
+docker-machine ssh ${KUBE_BUILD_VM} -L ${KUBE_RSYNC_PORT}:localhost:${KUBE_RSYNC_PORT} -N &
 ```
 
 Look at `docker-machine stop`, `docker-machine start` and `docker-machine rm` to manage this VM.