diff --git a/src/QmlControls/ParameterEditorController.cc b/src/QmlControls/ParameterEditorController.cc
index d4eaf5c..da3a9fc 100644
--- a/src/QmlControls/ParameterEditorController.cc
+++ b/src/QmlControls/ParameterEditorController.cc
@@ -352,7 +352,7 @@ void ParameterEditorController::resetAllToVehicleConfiguration(void)
     refresh();
 }
 
-bool ParameterEditorController::_shouldShow(Fact* fact)
+bool ParameterEditorController::_shouldShow(Fact* fact) const
 {
     bool show = _showModifiedOnly ? (fact->defaultValueAvailable() ? (fact->valueEqualsDefault() ? false : true) : false) : true;
     return show;
diff --git a/src/QmlControls/ParameterEditorController.h b/src/QmlControls/ParameterEditorController.h
index 717af92..e27ad8e 100644
--- a/src/QmlControls/ParameterEditorController.h
+++ b/src/QmlControls/ParameterEditorController.h
@@ -136,7 +136,7 @@ private slots:
     void _factAdded             (int compId, Fact* fact);
 
 private:
-    bool _shouldShow(Fact *fact);
+    bool _shouldShow(Fact *fact) const;
 
 private:
     ParameterManager*           _parameterMgr           = nullptr;