diff --git a/ObjectTypes/VolumeMeshObject/VolumeMeshNode.hh b/ObjectTypes/VolumeMeshObject/VolumeMeshNode.hh
index 3ce92eb1cd6d14b6d6c2beac403287dc004e3503..aa92059d46ecc6210fa01b9f9c02afa850dc9712 100644
--- a/ObjectTypes/VolumeMeshObject/VolumeMeshNode.hh
+++ b/ObjectTypes/VolumeMeshObject/VolumeMeshNode.hh
@@ -112,21 +112,21 @@ public:
     ACG_CLASSNAME(VolumeMeshNodeT)
 
     /// return available draw modes
-    DrawModes::DrawMode availableDrawModes() const;
+    DrawModes::DrawMode availableDrawModes() const override;
 
     /// update bounding box
-    void boundingBox(Vec3d& _bbMin, Vec3d& _bbMax);
+    void boundingBox(Vec3d& _bbMin, Vec3d& _bbMax) override;
 
     /// draw lines and normals
-    void draw(GLState& _state, const DrawModes::DrawMode& _drawMode);
+    void draw(GLState& _state, const DrawModes::DrawMode& _drawMode) override;
 
     /** \brief Draws the object deferred
     *
     */
-    void getRenderObjects(IRenderer* _renderer, GLState& _state, const DrawModes::DrawMode& _drawMode, const Material* _mat);
+    void getRenderObjects(IRenderer* _renderer, GLState& _state, const DrawModes::DrawMode& _drawMode, const Material* _mat) override;
 
     /// picking
-    void pick(GLState& _state, PickTarget _target);
+    void pick(GLState& _state, PickTarget _target) override;
 
     // clear all cutplanes
     void clear_cut_planes();