diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index df152aa1a3554f1436ff6e8040dcfff16d3de049..b170b43aed4c3deba84eedff598aa4a5fd21bca3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,4 +10,4 @@ slc6-gcc48:
     - export G4INSTALL="/cvmfs/sft.cern.ch/lcg/releases/ROOT/6.06.02-6cc9c/x86_64-slc6-gcc48-opt"
     - export G4ENV_INIT="$G4INSTALL/bin/thisroot.sh"
     - export G4SYSTEM="Linux-g++"
-    - test -r ${G4ENV_INIT} && { cd $(dirname ${G4ENV_INIT}) ; . ./$(basename ${G4ENV_INIT}) ; cd $OLDPWD ; }
+    - test -r ${G4ENV_INIT} && { cd $(dirname ${G4INSTALL}) ; . ./bin/$(basename ${G4ENV_INIT}) ; cd $OLDPWD ; }