diff --git a/src/Mod/Fem/Gui/TaskPostBoxes.h b/src/Mod/Fem/Gui/TaskPostBoxes.h
index d37742dd27..6b1f38c6df 100644
--- a/src/Mod/Fem/Gui/TaskPostBoxes.h
+++ b/src/Mod/Fem/Gui/TaskPostBoxes.h
@@ -577,7 +577,6 @@ private:
     void onOperatorsActivated(int index);
 
 private:
-    QWidget* proxy;
     std::unique_ptr<Ui_TaskPostCalculator> ui;
 };