diff --git a/components/script/dom/htmldetailselement.rs b/components/script/dom/htmldetailselement.rs
index 07c85ed6e2e..f8fc6545f8d 100644
--- a/components/script/dom/htmldetailselement.rs
+++ b/components/script/dom/htmldetailselement.rs
@@ -90,6 +90,8 @@ pub struct DetailsNotificationRunnable {
 }
 
 impl Runnable for DetailsNotificationRunnable {
+    fn name(&self) -> &'static str { "DetailsNotificationRunnable" }
+
     fn handler(self: Box<DetailsNotificationRunnable>) {
         let target = self.element.root();
         if target.check_toggle_count(self.toggle_number) {