diff --git a/dom/bindings/BindingUtils.cpp b/dom/bindings/BindingUtils.cpp
index d934e86716..080705174e 100644
--- a/dom/bindings/BindingUtils.cpp
+++ b/dom/bindings/BindingUtils.cpp
@@ -2210,6 +2210,11 @@ ReparentWrapper(JSContext* aCx, JS::Handle<JSObject*> aObjArg, ErrorResult& aErr
                                     js::GetReservedOrProxyPrivateSlot(aObj, DOM_OBJECT_SLOT));
   js::SetReservedOrProxyPrivateSlot(aObj, DOM_OBJECT_SLOT, JS::PrivateValue(nullptr));
 
+  aObj = xpc::TransplantObject(aCx, aObj, newobj);
+  if (!aObj) {
+    MOZ_CRASH();
+  }
+
   nsWrapperCache* cache = nullptr;
   CallQueryInterface(native, &cache);
   bool preserving = cache->PreservingWrapper();
@@ -2217,20 +2222,6 @@ ReparentWrapper(JSContext* aCx, JS::Handle<JSObject*> aObjArg, ErrorResult& aErr
   cache->SetWrapper(aObj);
   cache->SetPreservingWrapper(preserving);
 
-  aObj = xpc::TransplantObject(aCx, aObj, newobj);
-  if (!aObj) {
-    MOZ_CRASH();
-  }
-
-  // Update the wrapper cache again if transplanting didn't use newobj but
-  // returned some other object.
-  if (aObj != newobj) {
-    preserving = cache->PreservingWrapper();
-    cache->SetPreservingWrapper(false);
-    cache->SetWrapper(aObj);
-    cache->SetPreservingWrapper(preserving);
-  }
-
   if (propertyHolder) {
     JS::Rooted<JSObject*> copyTo(aCx);
     if (isProxy) {