diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 50a346987f40a460f38037b3cbc0a8f3a6e568b2..997bda9bfc0d7136a328cf30e4bbdf3812ae679a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -67,6 +67,7 @@ unit-tests:
   stage: "build"
   script:
     - |
+      set -x
       # GRID is set in one of the "instantiations" of this job template.
       nix-shell --run "morph build --show-trace morph/grid/${GRID}/grid.nix"