diff --git a/base/ci-helper:1 b/base/ci-helper:1
index 5c8e8f2f2cab16f94af45eee63f4739c05eb9402..8f89018ff95e50c4595512025e2537fd8655c685 100644
--- a/base/ci-helper:1
+++ b/base/ci-helper:1
@@ -2,5 +2,5 @@ FROM debian:buster
  MAINTAINER Tamas Gal <tgal@km3net.de>
 
  RUN apt-get update -qq
- RUN apt-get install -qq sshpass wget curl
+ RUN apt-get install -qq sshpass wget curl tree
  RUN apt-get clean