diff --git a/components/script/timers.rs b/components/script/timers.rs
index 66dd5ea12b8..23ae75ce98e 100644
--- a/components/script/timers.rs
+++ b/components/script/timers.rs
@@ -93,7 +93,7 @@ pub enum IsInterval {
 
 // Messages sent control timers from script task
 #[jstraceable]
-#[derive(PartialEq, Copy, Clone, Show)]
+#[derive(PartialEq, Copy, Clone, Debug)]
 pub enum TimerControlMsg {
     Cancel,
     Suspend,