diff --git a/src/Mod/Plot/Plot.py b/src/Mod/Plot/Plot.py
index b686dad60..723b85453 100644
--- a/src/Mod/Plot/Plot.py
+++ b/src/Mod/Plot/Plot.py
@@ -46,7 +46,7 @@ except ImportError:
 
 def getMainWindow():
     """ Return the FreeCAD main window. """
-    toplevel = PySide.QtGui.qApp.topLevelWidgets()
+    toplevel = PySide.QtGui.QApplication.topLevelWidgets()
     for i in toplevel:
         if i.metaObject().className() == "Gui::MainWindow":
             return i