diff --git a/interop_client/src/main.rs b/interop_client/src/main.rs
index 7b073c1e57..cb1a23579d 100644
--- a/interop_client/src/main.rs
+++ b/interop_client/src/main.rs
@@ -401,7 +401,11 @@ impl MlsClient for MlsClientImpl {
         // Store keys so OpenMLS can find them.
         crypto_provider
             .key_store()
-            .store(my_key_package.hpke_init_key().as_slice(), &private_key, None)
+            .store(
+                my_key_package.hpke_init_key().as_slice(),
+                &private_key,
+                None,
+            )
             .map_err(|_| Status::aborted("failed to interact with the key store"))?;
 
         // Store the key package in the key store with the hash reference as id
@@ -425,7 +429,11 @@ impl MlsClient for MlsClientImpl {
         // The key is the public key.
         crypto_provider
             .key_store()
-            .store::<HpkePrivateKey>(my_key_package.hpke_init_key().as_slice(), &private_key, None)
+            .store::<HpkePrivateKey>(
+                my_key_package.hpke_init_key().as_slice(),
+                &private_key,
+                None,
+            )
             .map_err(into_status)?;
 
         let welcome_msg = MlsMessageIn::tls_deserialize(&mut request.welcome.as_slice())
diff --git a/openmls/src/key_packages/mod.rs b/openmls/src/key_packages/mod.rs
index 2be54cbcfb..cfa8903fe8 100644
--- a/openmls/src/key_packages/mod.rs
+++ b/openmls/src/key_packages/mod.rs
@@ -669,7 +669,11 @@ impl KeyPackageBuilder {
         // The key is the public key.
         provider
             .key_store()
-            .store::<HpkePrivateKey>(key_package.hpke_init_key().as_slice(), &init_private_key, expiration)
+            .store::<HpkePrivateKey>(
+                key_package.hpke_init_key().as_slice(),
+                &init_private_key,
+                expiration,
+            )
             .map_err(KeyPackageNewError::KeyStoreError)?;
 
         Ok(key_package)
diff --git a/openmls/src/treesync/node/encryption_keys.rs b/openmls/src/treesync/node/encryption_keys.rs
index 4563e02827..76f7d3e381 100644
--- a/openmls/src/treesync/node/encryption_keys.rs
+++ b/openmls/src/treesync/node/encryption_keys.rs
@@ -240,7 +240,9 @@ pub mod test_utils {
     pub fn write_keys_from_key_store(provider: &impl OpenMlsProvider, encryption_key: HpkeKeyPair) {
         let keypair = EncryptionKeyPair::from(encryption_key);
 
-        keypair.write_to_key_store(provider.key_store(), None).unwrap();
+        keypair
+            .write_to_key_store(provider.key_store(), None)
+            .unwrap();
     }
 }
 
diff --git a/traits/src/key_store.rs b/traits/src/key_store.rs
index 1b6a196a2b..b903fe5320 100644
--- a/traits/src/key_store.rs
+++ b/traits/src/key_store.rs
@@ -34,7 +34,12 @@ pub trait OpenMlsKeyStore {
     /// serialization for ID `k`.
     ///
     /// Returns an error if storing fails.
-    fn store<V: MlsEntity>(&self, k: &[u8], v: &V, expiration: Option<u64>) -> Result<(), Self::Error>
+    fn store<V: MlsEntity>(
+        &self,
+        k: &[u8],
+        v: &V,
+        expiration: Option<u64>,
+    ) -> Result<(), Self::Error>
     where
         Self: Sized;