--- a/editor/libeditor/HTMLEditor.cpp
+++ b/editor/libeditor/HTMLEditor.cpp
@@ -2962,22 +2962,17 @@ HTMLEditor::EnableStyleSheet(const nsASt
 {
   RefPtr<StyleSheet> sheet = GetStyleSheetForURL(aURL);
   NS_ENSURE_TRUE(sheet, NS_OK); // Don't fail if sheet not found
 
   // Ensure the style sheet is owned by our document.
   nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocWeak);
   sheet->SetAssociatedDocument(doc, StyleSheet::NotOwnedByDocument);
 
-  if (sheet->IsServo()) {
-    // XXXheycam ServoStyleSheets don't support being enabled/disabled yet.
-    NS_ERROR("stylo: ServoStyleSheets can't be disabled yet");
-    return NS_ERROR_FAILURE;
-  }
-  return sheet->AsGecko()->SetDisabled(!aEnable);
+  return sheet->SetDisabled(!aEnable);
 }
 
 bool
 HTMLEditor::EnableExistingStyleSheet(const nsAString& aURL)
 {
   RefPtr<StyleSheet> sheet = GetStyleSheetForURL(aURL);
 
   // Enable sheet if already loaded.