diff --git a/rpi-update b/rpi-update
index d901382..278cb3f 100755
--- a/rpi-update
+++ b/rpi-update
@@ -23,7 +23,7 @@ LINUX_REPO_URI=${LINUX_REPO_URI:-"https://github.com/raspberrypi/linux"}
 LINUX_REPO_API_URI=${LINUX_REPO_URI/github.com/api.github.com\/repos}
 
 UPDATE_SELF=${UPDATE_SELF:-1}
-UPDATE_REPO_URI="https://github.com/raspberrypi/rpi-update"
+UPDATE_REPO_URI=${UPDATE_REPO_URI:-"https://github.com/raspberrypi/rpi-update"}
 UPDATE_REPO_CONTENT_URI=${UPDATE_REPO_URI/github.com/raw.githubusercontent.com}
 UPDATE_URI="${UPDATE_REPO_CONTENT_URI}/master/rpi-update"