diff --git a/Dockerfile b/Dockerfile
index 64071db..d5b2da5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,6 +30,7 @@
   && echo "$JENKINS_SHA /usr/share/jenkins/jenkins.war" | sha1sum -c -
 
 ENV JENKINS_UC https://updates.jenkins-ci.org
+ENV JENKINS_UC_DOWNLOAD $JENKINS_UC/download
 RUN chown -R jenkins "$JENKINS_HOME" /usr/share/jenkins/ref
 
 # for main web interface: