diff --git a/AABB_tree/demo/AABB_tree/Scene.cpp b/AABB_tree/demo/AABB_tree/Scene.cpp
index 53fba8fe327..33aa6055c1a 100644
--- a/AABB_tree/demo/AABB_tree/Scene.cpp
+++ b/AABB_tree/demo/AABB_tree/Scene.cpp
@@ -1310,7 +1310,7 @@ void Scene::deactivate_cutting_plane()
     disconnect(m_frame, SIGNAL(modified()), this, SLOT(cutting_plane()));
     m_view_plane = false;
 }
-void Scene::initGL(Viewer */* viewer */)
+void Scene::initGL(Viewer * /* viewer */)
 {
     //qDebug()<<"context from scene is valid :"<<context->isValid();
     //gl = 0;