diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f01eea58d..92040c67b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -92,7 +92,7 @@ backend dependencies:
         - .stack
         - .stack-work
   script:
-    - "nix shell .#gnumake .#stack .#coreutils --command 'prepare-env && make backend-dependencies'" # TODO maybe remove prepare-env
+    - "nix shell .#gnumake .#stack .#coreutils --command zsh -c 'prepare-env && make backend-dependencies'" # TODO maybe remove prepare-env
     - "ls -a ." # TODO: debug only
     - "ls -a ${HOME}/.stack"
   before_script: *nix-before