diff --git a/.github/workflows/_prek.yaml b/.github/workflows/_prek.yaml
new file mode 100644
index 000000000..63cd5a70f
--- /dev/null
+++ b/.github/workflows/_prek.yaml
@@ -0,0 +1,26 @@
+name: Prek Formatting Checks
+
+on:
+  workflow_call:
+
+jobs:
+  prek:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v6
+
+      - name: Setup Node
+        uses: actions/setup-node@v6.4.0
+        with:
+          node-version: "22.x"
+
+      - name: Install stable toolchain
+        uses: actions-rust-lang/setup-rust-toolchain@v1.16.1
+        with:
+          components: rustfmt
+
+      - name: Run prek hooks
+        uses: j178/prek-action@v2.0.6
+        with:
+          prek-version: "0.4.12"
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7a686bf2d..2d6e658e0 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -203,3 +203,8 @@ jobs:
     steps:
       - name: Lint Workflows
         uses: diamondlightsource/workflows@main
+
+  prek:
+    # Deduplicate jobs from pull requests and branch pushes within the same repo.
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository
+    uses: ./.github/workflows/_prek.yaml