--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@@ -2000,16 +2000,19 @@ Element::UnbindFromTree(bool aDeep, bool
   //
   // This can happen when the element changes the state of some ancestor up in
   // the tree, for example.
   //
   // Note that clearing the data itself here would have its own set of problems,
   // since the invariant we'd be breaking in that case is "HasServoData()
   // implies InComposedDoc()", which we rely on in various places.
   UnsetFlags(kAllServoDescendantBits);
+  if (document && document->GetServoRestyleRoot() == this) {
+    document->ClearServoRestyleRoot();
+  }
 }
 
 nsICSSDeclaration*
 Element::GetSMILOverrideStyle()
 {
   Element::nsExtendedDOMSlots* slots = ExtendedDOMSlots();
 
   if (!slots->mSMILOverrideStyle) {