diff --git a/components/script/dom/htmlmediaelement.rs b/components/script/dom/htmlmediaelement.rs
index 877a98311c4..bafc990d06a 100644
--- a/components/script/dom/htmlmediaelement.rs
+++ b/components/script/dom/htmlmediaelement.rs
@@ -777,6 +777,8 @@ impl DedicatedMediaSourceFailureTask {
 }
 
 impl Runnable for DedicatedMediaSourceFailureTask {
+    fn name(&self) -> &'static str { "DedicatedMediaSourceFailureTask" }
+
     fn handler(self: Box<DedicatedMediaSourceFailureTask>) {
         self.elem.root().dedicated_media_source_failure();
     }