diff --git a/src/Mod/Fem/Gui/TaskPostBoxes.cpp b/src/Mod/Fem/Gui/TaskPostBoxes.cpp
index 1166da49f8..2ee2b167b8 100644
--- a/src/Mod/Fem/Gui/TaskPostBoxes.cpp
+++ b/src/Mod/Fem/Gui/TaskPostBoxes.cpp
@@ -263,7 +263,7 @@ void TaskPostWidget::updateEnumerationList(App::PropertyEnumeration& prop, QComb
     box->setCurrentIndex(index);
 }
 
-void TaskPostWidget::handlePropertyChange(const App::DocumentObject& obj, const App::Property& prop)
+void TaskPostWidget::handlePropertyChange(const App::DocumentObject&, const App::Property& prop)
 {
     if (auto postobj = m_object.get<Fem::FemPostObject>()) {
         if (&prop == &postobj->Data) {