diff --git a/src/osgPlugins/txp/trpage_nodes.cpp b/src/osgPlugins/txp/trpage_nodes.cpp
index 852b1eba1..7d2760496 100644
--- a/src/osgPlugins/txp/trpage_nodes.cpp
+++ b/src/osgPlugins/txp/trpage_nodes.cpp
@@ -817,6 +817,8 @@ trpgChildRef::~trpgChildRef()
 // Reset
 void trpgChildRef::Reset()
 {
+    zmin = 0.0f;
+    zmax = 0.0f;
     x = -1;
     y = -1;
     lod = -1;