diff --git a/embassy-stm32/src/usart/ringbuffered.rs b/embassy-stm32/src/usart/ringbuffered.rs
index e2cd11b1b..3e14cf3cb 100644
--- a/embassy-stm32/src/usart/ringbuffered.rs
+++ b/embassy-stm32/src/usart/ringbuffered.rs
@@ -9,14 +9,15 @@ use embedded_io_async::ReadReady;
 use futures_util::future::{select, Either};
 
 use super::{
-    clear_interrupt_flags, rdr, reconfigure, set_baudrate, sr, Config, ConfigError, Error, Info, State, UartRx,
+    rdr, reconfigure, set_baudrate, sr, Config, ConfigError, Error, Info, State, UartRx,
 };
 use crate::dma::ReadableRingBuffer;
 use crate::gpio::{AnyPin, SealedPin as _};
 use crate::mode::Async;
+#[cfg(any(usart_v3, usart_v4))]
+use crate::pac::usart::regs;
 use crate::time::Hertz;
 use crate::usart::{Regs, Sr};
-use crate::pac::usart::regs;
 
 /// Rx-only Ring-buffered UART Driver
 ///