diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index cdfe354c..17b8353e 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -18,7 +18,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: nightly
-          components: rust-src
+          components: rust-src, rustfmt
           override: true
       - name: install
         run: rustup target add thumbv7em-none-eabi thumbv6m-none-eabi
diff --git a/ci.sh b/ci.sh
index d726db37..d169246b 100755
--- a/ci.sh
+++ b/ci.sh
@@ -4,6 +4,8 @@ set -euxo pipefail
 
 cd $(dirname $0)
 
+cargo fmt --all -- --check
+
 # embassy std
 (cd embassy-std-examples; cargo build)