diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 976fedf9b73a8e139b2d6523f099d9dfe976dfb9..6345dddb259086eee37391a4741e0a5cf7226144 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -44,8 +44,7 @@ variables:
 
 # ------------------------------------------------------------------------------
 spack:setup:
-  stage:
-    - environment
+  stage: environment
   extends:
     - .parallel_job
     - .setup_spack
@@ -62,8 +61,7 @@ spack:setup:
     - git clone https://gitlab.epfl.ch/SCITAS/software-stack/scitas-spack-packages.git
 
 spack:concretize:
-  stage:
-    - concretize
+  stage: concretize
   extends:
     - .parallel_job
     - .setup_spack
@@ -76,8 +74,7 @@ spack:concretize:
       - spack.lock
 
 spack:install:
-  stage:
-    - install
+  stage: install
   extends:
     - .parallel_job
     - .setup_spack