diff --git a/Jenkinsfile b/Jenkinsfile
index db18d13ddd..af33edb821 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -22,6 +22,7 @@ shopt -s huponexit # kill all child processes when the shell exits
 
 export CI=1
 export PYTHONWARNINGS=error
+export COMMA_CACHE=/data/tmp/comma_download_cache
 #export LOGPRINT=debug # this has gotten too spammy...
 export TEST_DIR=${env.TEST_DIR}
 export SOURCE_DIR=${env.SOURCE_DIR}