diff --git a/embassy-stm32-examples/src/bin/serial.rs b/embassy-stm32-examples/src/bin/serial.rs
index 320f1ec87..78ad06ab2 100644
--- a/embassy-stm32-examples/src/bin/serial.rs
+++ b/embassy-stm32-examples/src/bin/serial.rs
@@ -76,5 +76,5 @@ async fn main(spawner: Spawner) {
 
     buf[5] = 0x01;
     serial.as_mut().write(buf).await.unwrap();
-    serial.as_mut().read_until_idle(buf);
+    serial.as_mut().read_until_idle(buf).await.unwrap();
 }