diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4356fd0..adbdc6c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,6 +6,7 @@ build:
   image: registry.gitlab.gnome.org/jwestman/blueprint-compiler
   stage: build
   script:
+    - black --check .
     - mypy blueprintcompiler
     - coverage run -m unittest
     - coverage html
diff --git a/build-aux/Dockerfile b/build-aux/Dockerfile
index c7c9786..6e30974 100644
--- a/build-aux/Dockerfile
+++ b/build-aux/Dockerfile
@@ -1,5 +1,5 @@
 FROM fedora:latest
 
 RUN dnf install -y meson python3-pip gtk4-devel gobject-introspection-devel libadwaita-devel
-RUN pip3 install furo mypy sphinx coverage
+RUN pip3 install furo mypy sphinx coverage black
 RUN dnf install -y git