diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 56649bcf5..b0b86d8c8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -68,7 +68,7 @@ jobs:
     - name: Install toolchain
       uses: dtolnay/rust-toolchain@nightly
       with:
-        components: clippy
+        components: clippy, rustfmt
 
     - name: rust cache
       uses: Swatinem/rust-cache@v2
@@ -86,6 +86,9 @@ jobs:
     - name: "rustdoc"
       run: cargo rustdoc -p riot-rs-embassy -- -D warnings
 
+    - name: rustfmt
+      run: cargo fmt --check --all
+
   CI-success:
       if: ${{ always() }}
       runs-on: ubuntu-latest
diff --git a/src/riot-rs-embassy/src/arch/mod.rs b/src/riot-rs-embassy/src/arch/mod.rs
index e69de29bb..8b1378917 100644
--- a/src/riot-rs-embassy/src/arch/mod.rs
+++ b/src/riot-rs-embassy/src/arch/mod.rs
@@ -0,0 +1 @@
+