diff --git a/components/sceneutil/mwshadowtechnique.cpp b/components/sceneutil/mwshadowtechnique.cpp
index 64c2e6e55f..4125ebe7d1 100644
--- a/components/sceneutil/mwshadowtechnique.cpp
+++ b/components/sceneutil/mwshadowtechnique.cpp
@@ -25,6 +25,8 @@
 
 #include <sstream>
 
+namespace {
+
 using namespace osgShadow;
 using namespace SceneUtil;
 
@@ -331,6 +333,8 @@ void VDSMCameraCullCallback::operator()(osg::Node* node, osg::NodeVisitor* nv)
     _projectionMatrix = cv->getProjectionMatrix();
 }
 
+} // namespace
+
 MWShadowTechnique::ComputeLightSpaceBounds::ComputeLightSpaceBounds(osg::Viewport* viewport, const osg::Matrixd& projectionMatrix, osg::Matrixd& viewMatrix) :
     osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ACTIVE_CHILDREN)
 {