diff --git a/dom/usb/USBBackendWin.cpp b/dom/usb/USBBackendWin.cpp
index a696756803..f578d808cb 100644
--- a/dom/usb/USBBackendWin.cpp
+++ b/dom/usb/USBBackendWin.cpp
@@ -32,8 +32,6 @@ public:
   {
   }
 
-  NS_DECL_ISUPPORTS
-
   nsresult Open() override
   {
     if (mPath.IsEmpty()) {
diff --git a/dom/usb/USBDevice.cpp b/dom/usb/USBDevice.cpp
index 34eb841e95..74366062bd 100644
--- a/dom/usb/USBDevice.cpp
+++ b/dom/usb/USBDevice.cpp
@@ -80,7 +80,7 @@ CopyTransferData(const ArrayBufferViewOrArrayBuffer& aData,
 } // anonymous namespace
 
 NS_IMPL_CYCLE_COLLECTION_INHERITED(USBDevice, DOMEventTargetHelper,
-                                   mHandle, mConfiguration, mConfigurations)
+                                   mConfiguration, mConfigurations)
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(USBDevice)
 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)