diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4a2907f..13a58d6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,6 +8,19 @@ permissions:
   contents: read
 
 jobs:
+  fmt:
+    name: 🎨 Check formatting
+    runs-on: ubuntu-latest
+    steps:
+      - name: 🛠 Checkout
+        uses: actions/checkout@v6
+
+      - name: 🧰 Install rustfmt
+        run: rustup component add rustfmt
+
+      - name: 🎨 Cargo fmt
+        run: cargo fmt --all -- --check
+
   test:
     name: 🧪 ${{ matrix.task }} (${{ matrix.profile }})
     runs-on: ubuntu-latest
diff --git a/src/ext_type.rs b/src/ext_type.rs
index 358c64b..33757ee 100644
--- a/src/ext_type.rs
+++ b/src/ext_type.rs
@@ -143,7 +143,7 @@ where
     T: Serialize + DeserializeOwned,
 {
     let Some(filename) = filename else {
-        return Ok(None)
+        return Ok(None);
     };
 
     let full_path = path.join(filename);