diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index 43a4473689e..c14a2b80959 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -2869,6 +2869,8 @@ impl DocumentProgressHandler {
 }
 
 impl Runnable for DocumentProgressHandler {
+    fn name(&self) -> &'static str { "DocumentProgressHandler" }
+
     fn handler(self: Box<DocumentProgressHandler>) {
         let document = self.addr.root();
         let window = document.window();