--- a/plugins/extensions/pykrita/plugin/krita/sceditor/dockwidget.py

+++ b/plugins/extensions/pykrita/plugin/krita/sceditor/dockwidget.py

@@ -62,7 +62,7 @@ class DockWidgetTitleBarButton(QAbstract

         opt.icon = self.icon()

         opt.subControls = QStyle.SubControls()

         opt.activeSubControls = QStyle.SubControls()

-        opt.features = QStyleOptionToolButton.None

+        opt.features = QStyleOptionToolButton.None_

         opt.arrowType = Qt.NoArrow

         size = self.style().pixelMetric(QStyle.PM_SmallIconSize, None, self)

         opt.iconSize = QSize(size, size)