diff --git a/devices/src/legacy/uart_pl011.rs b/devices/src/legacy/uart_pl011.rs
index d698bbcb4..d355ffd69 100644
--- a/devices/src/legacy/uart_pl011.rs
+++ b/devices/src/legacy/uart_pl011.rs
@@ -465,8 +465,7 @@ impl Migratable for Pl011 {}
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::io;
-    use std::sync::{Arc, Mutex};
+    use std::sync::Mutex;
     use vm_device::interrupt::{InterruptIndex, InterruptSourceConfig};
     use vmm_sys_util::eventfd::EventFd;