diff --git a/embassy-stm32/src/timer/low_level.rs b/embassy-stm32/src/timer/low_level.rs
index 6377054c5..3136ea4e9 100644
--- a/embassy-stm32/src/timer/low_level.rs
+++ b/embassy-stm32/src/timer/low_level.rs
@@ -201,9 +201,7 @@ impl<'d, T: CoreInstance> Timer<'d, T> {
     }
 
     pub(crate) unsafe fn clone_unchecked(&self) -> ManuallyDrop<Self> {
-        // this doesn't work for some reason
-        // let tim = unsafe { self.tim.clone_unchecked() };
-        let tim = todo!();
+        let tim = unsafe { self.tim.clone_unchecked() };
         ManuallyDrop::new(Self { tim })
     }
 
diff --git a/embassy-stm32/src/timer/mod.rs b/embassy-stm32/src/timer/mod.rs
index 6cf22689b..aa9dd91d9 100644
--- a/embassy-stm32/src/timer/mod.rs
+++ b/embassy-stm32/src/timer/mod.rs
@@ -67,7 +67,7 @@ impl State {
     }
 }
 
-trait SealedInstance: RccPeripheral {
+trait SealedInstance: RccPeripheral + Peripheral<P = Self> {
     /// Async state for this timer
     fn state() -> &'static State;
 }