diff --git a/src/Mod/Fem/Gui/TaskFemConstraintForce.cpp b/src/Mod/Fem/Gui/TaskFemConstraintForce.cpp
index 4eb50841d9a8..514a19e155f1 100644
--- a/src/Mod/Fem/Gui/TaskFemConstraintForce.cpp
+++ b/src/Mod/Fem/Gui/TaskFemConstraintForce.cpp
@@ -290,6 +290,7 @@ void TaskFemConstraintForce::onButtonDirection(const bool pressed)
 {
     // sets the normal vector of the currently selecteed planar face as direction
 
+    Q_UNUSED(pressed)
     //get vector of selected objects of active document
     std::vector<Gui::SelectionObject> selection = Gui::Selection().getSelectionEx(); 
     if (selection.size() == 0) {