diff --git a/embassy-stm32/src/usart/buffered.rs b/embassy-stm32/src/usart/buffered.rs
index a2e4ceaa..f2014fe0 100644
--- a/embassy-stm32/src/usart/buffered.rs
+++ b/embassy-stm32/src/usart/buffered.rs
@@ -82,7 +82,7 @@ impl<T: BasicInstance> interrupt::typelevel::Handler<T::Interrupt> for Interrupt
     }
 }
 
-pub struct State {
+struct State {
     rx_waker: AtomicWaker,
     rx_buf: RingBuffer,