diff --git a/.woodpecker/check_fmt.yaml b/.woodpecker/check_fmt.yaml
new file mode 100644
index 0000000..704e5c0
--- /dev/null
+++ b/.woodpecker/check_fmt.yaml
@@ -0,0 +1,9 @@
+when:
+  - event: push
+  branch: main
+
+steps:
+  - name: "Run nix flake check"
+    image: docker.nix-community.org/nixpkgs/nix-flakes
+    commands:
+      - nix fmt -- --fail-on-change