--- a/eric7/HelpViewer/HelpViewerImpl_qwe.py	Sat Oct 16 20:38:23 2021 +0200
+++ b/eric7/HelpViewer/HelpViewerImpl_qwe.py	Sat Oct 16 20:41:44 2021 +0200
@@ -555,7 +555,7 @@
             UI.PixmapCache.getIcon("zoomIn"),
             self.tr("Zoom in"),
             self.scaleUp)
-        act.setEnabled(self.isScaleUpAvailable)
+        act.setEnabled(self.isScaleUpAvailable())
         
         act = menu.addAction(
             UI.PixmapCache.getIcon("zoomOut"),