diff --git a/dom/webidl/USB.webidl b/dom/webidl/USB.webidl
index 77a57195c6..8fc9934324 100644
--- a/dom/webidl/USB.webidl
+++ b/dom/webidl/USB.webidl
@@ -6,7 +6,7 @@ interface USB : EventTarget {
   Promise<sequence<USBDevice>> getDevices();
 
   [NewObject]
-  Promise<USBDevice> requestDevice(optional USBDeviceRequestOptions options = {});
+  Promise<USBDevice> requestDevice(optional USBDeviceRequestOptions options);
 
   attribute EventHandler onconnect;
   attribute EventHandler ondisconnect;