diff --git a/freertos-rust/src/mutex.rs b/freertos-rust/src/mutex.rs
index 6e929e4..fb43eff 100644
--- a/freertos-rust/src/mutex.rs
+++ b/freertos-rust/src/mutex.rs
@@ -6,9 +6,9 @@ use crate::units::*;
 pub type Mutex<T> = MutexImpl<T, MutexNormal>;
 pub type RecursiveMutex<T> = MutexImpl<T, MutexRecursive>;
 
-unsafe impl<T: Sync + Send, M> Send for MutexImpl<T, M> {}
+unsafe impl<T: Send, M> Send for MutexImpl<T, M> {}
 
-unsafe impl<T: Sync + Send, M> Sync for MutexImpl<T, M> {}
+unsafe impl<T: Send, M> Sync for MutexImpl<T, M> {}
 
 /// Mutual exclusion access to a contained value. Can be recursive -
 /// the current owner of a lock can re-lock it.