--- a/layout/style/ServoStyleSet.cpp
+++ b/layout/style/ServoStyleSet.cpp
@@ -364,16 +364,22 @@ ServoStyleSet::SetAuthorStyleDisabled(bo
 
   mAuthorStyleDisabled = aStyleDisabled;
   if (Element* root = mDocument->GetRootElement()) {
     if (nsPresContext* pc = GetPresContext()) {
       pc->RestyleManager()->PostRestyleEvent(root, eRestyle_Subtree, nsChangeHint(0));
     }
   }
   Servo_StyleSet_SetAuthorStyleDisabled(mRawSet.get(), mAuthorStyleDisabled);
+  // XXX Workaround for the assertion in InvalidateStyleForDocumentStateChanges
+  // which is called by nsIPresShell::SetAuthorStyleDisabled via nsIPresShell::
+  // RestyleForCSSRuleChanges. It is not really necessary because we don't need
+  // to rebuild stylist for this change. But we have bug around this, and we
+  // may want to rethink how things should work. See bug 1437785.
+  SetStylistStyleSheetsDirty();
 }
 
 void
 ServoStyleSet::BeginUpdate()
 {
 }
 
 nsresult