diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1cc8f51..e44422e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -81,6 +81,12 @@ build:
   script:
     - colmena build
 
+linter:
+  <<: *builder
+  stage: test
+  script:
+    - nix fmt
+
 # dns always has to be deployed first
 deploy_dns:
   <<: *builder