diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 36f73b97063bf94ea2b4d4eb6ae2258e83f4572b..966b65bd96a6fa0b8fdf2a85373bc70a603d2db9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,4 +4,4 @@ slc6-gcc48:
   image: clicdp/slc6-base
   script:
     - cd /cvmfs/sft.cern.ch/lcg/releases/LCG_84/ROOT/6.06.02/x86_64-slc6-gcc48-opt/bin
-    - ./thisroot.sh
+    - source thisroot.sh