diff --git a/qtpy/tests/test_qtwidgets.py b/qtpy/tests/test_qtwidgets.py
index dd423a3d..f0997b11 100644
--- a/qtpy/tests/test_qtwidgets.py
+++ b/qtpy/tests/test_qtwidgets.py
@@ -144,7 +144,7 @@ def test_QMenu_functions(qtbot):
 def test_QMenu_submenu_instance(qtbot):
     """Test `QtWidgets.QMenu` submenus are `QtWidgets.QMenu` instances."""
     menu = QtWidgets.QMenu()
-    menu.addMenu('test')
+    menu.addMenu("test")
     submenu = menu.children()[1]
     assert isinstance(submenu, QtWidgets.QMenu)