diff --git a/polkadot/node/service/src/lib.rs b/polkadot/node/service/src/lib.rs
index c299337323..c48ae9ea2f 100644
--- a/polkadot/node/service/src/lib.rs
+++ b/polkadot/node/service/src/lib.rs
@@ -1286,7 +1286,7 @@ macro_rules! chain_ops {
 /// Builds a new object suitable for chain operations.
 #[cfg(feature = "full-node")]
 pub fn new_chain_ops(
-	mut config: &mut Configuration,
+	config: &mut Configuration,
 	jaeger_agent: Option<std::net::SocketAddr>,
 ) -> Result<
 	(
diff --git a/polkadot/runtime/common/src/paras_registrar.rs b/polkadot/runtime/common/src/paras_registrar.rs
index 8c080286ac..284decff46 100644
--- a/polkadot/runtime/common/src/paras_registrar.rs
+++ b/polkadot/runtime/common/src/paras_registrar.rs
@@ -433,12 +433,12 @@ impl<T: Config> Registrar for Pallet<T> {
 
 	// Apply a lock to the parachain.
 	fn apply_lock(id: ParaId) {
-		Paras::<T>::mutate(id, |x| x.as_mut().map(|mut info| info.locked = true));
+		Paras::<T>::mutate(id, |x| x.as_mut().map(|info| info.locked = true));
 	}
 
 	// Remove a lock from the parachain.
 	fn remove_lock(id: ParaId) {
-		Paras::<T>::mutate(id, |x| x.as_mut().map(|mut info| info.locked = false));
+		Paras::<T>::mutate(id, |x| x.as_mut().map(|info| info.locked = false));
 	}
 
 	// Register a Para ID under control of `manager`.