diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f2e0e30..ae1dd81 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -12,7 +12,7 @@ black:
     - pip install -U black==19.10b0
 
   script:
-    - black .
+    - black --check .
 
 
 # https://github.com/python-gitlab/python-gitlab/blob/master/.gitlab-ci.yml used for reference