diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 471e888f2..8b59e5e3f 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -37,3 +37,5 @@ jobs:
         ./build.sh
     - name: Run tests
       run: cargo test --all --verbose
+    - name: Ensure no files have changed
+      run: git diff --exit-code