diff --git a/cros_async/src/sync/mu.rs b/cros_async/src/sync/mu.rs
index 596c4630e8..0648839039 100644
--- a/cros_async/src/sync/mu.rs
+++ b/cros_async/src/sync/mu.rs
@@ -826,7 +826,7 @@ unsafe impl<T: ?Sized + Send> Send for RwLock<T> {}
 #[allow(clippy::undocumented_unsafe_blocks)]
 unsafe impl<T: ?Sized + Send> Sync for RwLock<T> {}
 
-impl<T: ?Sized + Default> Default for RwLock<T> {
+impl<T: Default> Default for RwLock<T> {
     fn default() -> Self {
         Self::new(Default::default())
     }
diff --git a/cros_async/src/sync/spin.rs b/cros_async/src/sync/spin.rs
index 9af83a13df..20bdd41749 100644
--- a/cros_async/src/sync/spin.rs
+++ b/cros_async/src/sync/spin.rs
@@ -100,7 +100,7 @@ unsafe impl<T: ?Sized + Send> Send for SpinLock<T> {}
 #[allow(clippy::undocumented_unsafe_blocks)]
 unsafe impl<T: ?Sized + Send> Sync for SpinLock<T> {}
 
-impl<T: ?Sized + Default> Default for SpinLock<T> {
+impl<T: Default> Default for SpinLock<T> {
     fn default() -> Self {
         Self::new(Default::default())
     }