diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 49ed3a0..9466806 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -14,7 +14,7 @@ test:
 
 build:
   stage: build
-  tags: "shell"
+  tags: ["shell"]
   script:
     - ls -hal
     - mv env.vanilla env