diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index cc1f53a..c427162 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -48,7 +48,7 @@ build-packages:      # This job runs in the deploy stage.
     - git config --global user.name "Maximilian Keßler (via gitlab runner)"
   script:
     - echo "Building packages incrementally..."
-    - source .ci/ci_build.sh
+    - sh ci/ci_build.sh
   variables:
       GIT_SUBMODULE_STRATEGY: recursive
   artifacts: