diff --git a/components/script/dom/webidls/Worker.webidl b/components/script/dom/webidls/Worker.webidl
index 9e5d2c36ad9..481c2d44849 100644
--- a/components/script/dom/webidls/Worker.webidl
+++ b/components/script/dom/webidls/Worker.webidl
@@ -6,7 +6,7 @@
 // https://www.whatwg.org/html/#abstractworker
 [NoInterfaceObject/*, Exposed=Window,Worker*/]
 interface AbstractWorker {
-  //         attribute EventHandler onerror;
+    attribute EventHandler onerror;
 };
 
 // https://www.whatwg.org/html/#worker
diff --git a/components/script/dom/worker.rs b/components/script/dom/worker.rs
index 435de83ecff..d2b3982c805 100644
--- a/components/script/dom/worker.rs
+++ b/components/script/dom/worker.rs
@@ -163,6 +163,7 @@ impl WorkerMethods for Worker {
     }
 
     event_handler!(message, GetOnmessage, SetOnmessage);
+    event_handler!(error, GetOnerror, SetOnerror);
 }
 
 pub struct WorkerMessageHandler {
diff --git a/tests/wpt/metadata/html/dom/interfaces.html.ini b/tests/wpt/metadata/html/dom/interfaces.html.ini
index cb01cd8f47d..080c6d4e7d5 100644
--- a/tests/wpt/metadata/html/dom/interfaces.html.ini
+++ b/tests/wpt/metadata/html/dom/interfaces.html.ini
@@ -8430,9 +8430,6 @@
   [Worker interface: operation terminate()]
     expected: FAIL
 
-  [Worker interface: attribute onerror]
-    expected: FAIL
-
   [SharedWorker interface: existence and properties of interface object]
     expected: FAIL