diff --git a/src/osgUtil/CullVisitor.cpp b/src/osgUtil/CullVisitor.cpp
index b972aeed7..fcf444d3d 100644
--- a/src/osgUtil/CullVisitor.cpp
+++ b/src/osgUtil/CullVisitor.cpp
@@ -48,6 +48,7 @@ CullVisitor::CullVisitor():
     NodeVisitor(CULL_VISITOR,TRAVERSE_ACTIVE_CHILDREN),
     _currentStateGraph(NULL),
     _currentRenderBin(NULL),
+    _traversalNumber(0),
     _computed_znear(FLT_MAX),
     _computed_zfar(-FLT_MAX),
     _currentReuseRenderLeafIndex(0),
@@ -61,6 +62,7 @@ CullVisitor::CullVisitor(const CullVisitor& rhs):
     CullStack(rhs),
     _currentStateGraph(NULL),
     _currentRenderBin(NULL),
+    _traversalNumber(0),
     _computed_znear(FLT_MAX),
     _computed_zfar(-FLT_MAX),
     _currentReuseRenderLeafIndex(0),