diff --git a/containments/desktop/plugins/folder/menuhelper.h b/containments/desktop/plugins/folder/menuhelper.h
--- a/containments/desktop/plugins/folder/menuhelper.h
+++ b/containments/desktop/plugins/folder/menuhelper.h
@@ -32,7 +32,7 @@
         explicit MenuHelper(QObject *parent = nullptr);
         ~MenuHelper();
 
-        Q_INVOKABLE QString iconName(QAction *action);
+        Q_INVOKABLE QString iconName(QAction *action) const;
 
         Q_INVOKABLE void setMenu(QAction *action, QObject *menu);
 };
diff --git a/containments/desktop/plugins/folder/menuhelper.cpp b/containments/desktop/plugins/folder/menuhelper.cpp
--- a/containments/desktop/plugins/folder/menuhelper.cpp
+++ b/containments/desktop/plugins/folder/menuhelper.cpp
@@ -30,7 +30,7 @@
 {
 }
 
-QString MenuHelper::iconName(QAction *action)
+QString MenuHelper::iconName(QAction *action) const
 {
     if (!action) {
         return QString();
diff --git a/containments/desktop/plugins/folder/placesmodel.h b/containments/desktop/plugins/folder/placesmodel.h
--- a/containments/desktop/plugins/folder/placesmodel.h
+++ b/containments/desktop/plugins/folder/placesmodel.h
@@ -34,7 +34,7 @@
         explicit PlacesModel(QObject *parent = nullptr);
         ~PlacesModel();
 
-        bool activityLinkingEnabled();
+        bool activityLinkingEnabled() const;
 
         QHash<int, QByteArray> roleNames() const override;
         Q_INVOKABLE QString urlForIndex(int idx) const;
diff --git a/containments/desktop/plugins/folder/placesmodel.cpp b/containments/desktop/plugins/folder/placesmodel.cpp
--- a/containments/desktop/plugins/folder/placesmodel.cpp
+++ b/containments/desktop/plugins/folder/placesmodel.cpp
@@ -47,7 +47,7 @@
     return roleNames;
 }
 
-bool PlacesModel::activityLinkingEnabled()
+bool PlacesModel::activityLinkingEnabled() const
 {
     const KService::List services = KServiceTypeTrader::self()->query(QStringLiteral("KFileItemAction/Plugin"),
         QStringLiteral("Library == 'kactivitymanagerd_fileitem_linking_plugin'"));
diff --git a/containments/desktop/plugins/folder/rubberband.h b/containments/desktop/plugins/folder/rubberband.h
--- a/containments/desktop/plugins/folder/rubberband.h
+++ b/containments/desktop/plugins/folder/rubberband.h
@@ -32,7 +32,7 @@
 
         void paint(QPainter* painter) override;
 
-        Q_INVOKABLE bool intersects(const QRectF &rect);
+        Q_INVOKABLE bool intersects(const QRectF &rect) const;
 
     protected:
         void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) override;
diff --git a/containments/desktop/plugins/folder/rubberband.cpp b/containments/desktop/plugins/folder/rubberband.cpp
--- a/containments/desktop/plugins/folder/rubberband.cpp
+++ b/containments/desktop/plugins/folder/rubberband.cpp
@@ -48,7 +48,7 @@
     qApp->style()->drawControl(QStyle::CE_RubberBand, &opt, painter);
 }
 
-bool RubberBand::intersects(const QRectF &rect)
+bool RubberBand::intersects(const QRectF &rect) const
 {
     return m_geometry.intersects(rect);
 }