diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 62b30cb92f8ebbce29a8937db9d6341972101666..7fe4ae22d16cf4fded32ac747e286910a2e44a4f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,6 +3,6 @@ slc6-gcc48:
     - docker
   image: cern/slc6-base
   script:
-    - yum install which -y
+    - yum install which man -y
     - cd /afs/cern.ch/user/m/mpetric/public/root
     - . ./bin/thisroot.sh