diff --git a/embassy-stm32/src/rcc/f4.rs b/embassy-stm32/src/rcc/f4.rs
index 17834784a..2f851cfa1 100644
--- a/embassy-stm32/src/rcc/f4.rs
+++ b/embassy-stm32/src/rcc/f4.rs
@@ -97,7 +97,7 @@ fn setup_i2s_pll(vco_in: u32, plli2s: Option<u32>) -> Option<u32> {
 }
 
 #[cfg(not(any(stm32f427, stm32f429, stm32f437, stm32f439, stm32f446, stm32f469, stm32f479)))]
-fn setup_sai_pll(vco_in: u32, _pllsai: Option<u32>) -> Option<u32> {
+fn setup_sai_pll(_vco_in: u32, _pllsai: Option<u32>) -> Option<u32> {
     None
 }
 
diff --git a/embassy-stm32/src/sai/mod.rs b/embassy-stm32/src/sai/mod.rs
index aa996a99a..d2949e9a0 100644
--- a/embassy-stm32/src/sai/mod.rs
+++ b/embassy-stm32/src/sai/mod.rs
@@ -3,7 +3,7 @@
 use embassy_embedded_hal::SetConfig;
 use embassy_hal_internal::{into_ref, PeripheralRef};
 
-use crate::dma::{Channel, ReadableRingBuffer, TransferOptions, WritableRingBuffer};
+use crate::dma::{ringbuffer, Channel, ReadableRingBuffer, TransferOptions, WritableRingBuffer};
 use crate::gpio::sealed::{AFType, Pin as _};
 use crate::gpio::AnyPin;
 use crate::pac::sai::{vals, Sai as Regs};
@@ -17,6 +17,13 @@ pub use crate::dma::word;
 pub enum Error {
     NotATransmitter,
     NotAReceiver,
+    OverrunError,
+}
+
+impl From<ringbuffer::OverrunError> for Error {
+    fn from(_: ringbuffer::OverrunError) -> Self {
+        Self::OverrunError
+    }
 }
 
 #[derive(Copy, Clone)]
@@ -499,6 +506,7 @@ pub enum SubBlock {
 
 enum RingBuffer<'d, C: Channel, W: word::Word> {
     Writable(WritableRingBuffer<'d, C, W>),
+    #[allow(dead_code)] // remove this after implementing new_* functions for receiver
     Readable(ReadableRingBuffer<'d, C, W>),
 }