diff --git a/src/osgShadow/ShadowMap.cpp b/src/osgShadow/ShadowMap.cpp
index 246489891..f5e9f0846 100644
--- a/src/osgShadow/ShadowMap.cpp
+++ b/src/osgShadow/ShadowMap.cpp
@@ -85,6 +85,8 @@ void ShadowMap::init()
     _texture->setShadowTextureMode(osg::Texture2D::LUMINANCE);
     _texture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
     _texture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
+    _texture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_EDGE);
+    _texture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_EDGE);
 
     // set up the render to texture camera.
     {