diff --git a/src/menu.rs b/src/menu.rs
index 947bc69..baa7ea0 100644
--- a/src/menu.rs
+++ b/src/menu.rs
@@ -40,8 +40,17 @@ fn read(input: &mut Input, timeout: &Duration) -> Result<MenuOperation> {
         uefi::boot::create_event_ex(EventType::TIMER, Tpl::CALLBACK, None, None, None)
             .context("unable to create timer event")?
     };
+
     // The timeout is in increments of 100 nanoseconds.
-    let trigger = TimerTrigger::Relative(timeout.as_nanos() as u64 / 100);
+    let timeout_hundred_nanos = timeout.as_nanos() / 100;
+
+    // Check if the timeout is too large to fit into an u64.
+    if timeout_hundred_nanos > u64::MAX as u128 {
+        bail!("timeout duration overflow");
+    }
+
+    // Set a timer to trigger after the specified duration.
+    let trigger = TimerTrigger::Relative(timeout_hundred_nanos as u64);
     uefi::boot::set_timer(&timer_event, trigger).context("unable to set timeout timer")?;
 
     let mut events = vec![timer_event, key_event];