diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 812b0a9..342112c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,7 +7,7 @@ stages:
 build-html:
   stage: build
   before_script:
-    cask install
+    - cask install
   script:
     make html
   artifacts: