diff --git a/components/sceneutil/mwshadowtechnique.cpp b/components/sceneutil/mwshadowtechnique.cpp
index 6f3d34cb1..08117b4f9 100644
--- a/components/sceneutil/mwshadowtechnique.cpp
+++ b/components/sceneutil/mwshadowtechnique.cpp
@@ -474,7 +474,7 @@ void MWShadowTechnique::LightData::setLightData(osg::RefMatrix* lm, const osg::L
         lightDir.set(-lightPos.x(), -lightPos.y(), -lightPos.z());
         lightDir.normalize();
         OSG_INFO<<"   Directional light, lightPos="<<lightPos<<", lightDir="<<lightDir<<std::endl;
-        if (lightMatrix.valid())
+        if (lightMatrix.valid() && *lightMatrix != osg::Matrixf(modelViewMatrix))
         {
             OSG_INFO<<"   Light matrix "<<*lightMatrix<<std::endl;
             osg::Matrix lightToLocalMatrix(*lightMatrix * osg::Matrix::inverse(modelViewMatrix) );