diff --git a/src/osgSim/LightPointNode.cpp b/src/osgSim/LightPointNode.cpp
index 9b2704d91..1c03170b4 100644
--- a/src/osgSim/LightPointNode.cpp
+++ b/src/osgSim/LightPointNode.cpp
@@ -57,6 +57,7 @@ LightPointNode::LightPointNode():
 /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
 LightPointNode::LightPointNode(const LightPointNode& lpn,const osg::CopyOp& copyop):
     osg::Node(lpn,copyop),
+    _bbox(lpn._bbox),
     _lightPointList(lpn._lightPointList),
     _minPixelSize(lpn._minPixelSize),
     _maxPixelSize(lpn._maxPixelSize),