diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8f0b2f06a0db109f8a80bda5e538c781b4cfd637..5cc2737b45f56462bd9e7819ac2cff439dcf7863 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,16 +1,16 @@
 docs:
-  stage: build
+  stage: "build"
   script:
-    - nix-shell --run 'nix-build docs.nix'
+    - "nix-shell --run 'nix-build docs.nix'"
 
 unit-tests:
-  stage: test
+  stage: "test"
   script:
-    - nix-shell --run 'nix-build nixos/unit-tests.nix' && cat result
+    - "nix-shell --run 'nix-build nixos/unit-tests.nix' && cat result"
 
 system-tests:
-  stage: test
-  timeout: 3 hours
+  stage: "test"
+  timeout: "3 hours"
   script:
-    - nix-shell --run 'nix-build nixos/system-tests.nix'
+    - "nix-shell --run 'nix-build nixos/system-tests.nix'"