1 files changed, 3 insertions, 3 deletions
diff --git a/components/script/dom/webidls/Worker.webidl b/components/script/dom/webidls/Worker.webidl
index 93df577ec32..b391d65b2ab 100644
--- a/components/script/dom/webidls/Worker.webidl
+++ b/components/script/dom/webidls/Worker.webidl
@@ -12,10 +12,10 @@ interface mixin AbstractWorker {
 [Exposed=(Window,Worker)]
 interface Worker : EventTarget {
   [Throws] constructor(USVString scriptURL, optional WorkerOptions options = {});
-  void terminate();
+  undefined terminate();
 
-  [Throws] void postMessage(any message, sequence<object> transfer);
-  [Throws] void postMessage(any message, optional PostMessageOptions options = {});
+  [Throws] undefined postMessage(any message, sequence<object> transfer);
+  [Throws] undefined postMessage(any message, optional PostMessageOptions options = {});
   attribute EventHandler onmessage;
   attribute EventHandler onmessageerror;
 };