diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index db67572..10170a8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,6 +29,11 @@ jobs:
         toolchain: stable
         profile: minimal
 
+    - name: check formatting
+      uses: actions-rs/cargo@v1
+      with:
+        command: fmt
+        args: --check
     - name: Test with a feature subset
       uses: actions-rs/cargo@v1
       with: