diff --git a/src/osgPlugins/osgjs/JSON_Objects.cpp b/src/osgPlugins/osgjs/JSON_Objects.cpp
index 65a2ba4ef..69a259223 100644
--- a/src/osgPlugins/osgjs/JSON_Objects.cpp
+++ b/src/osgPlugins/osgjs/JSON_Objects.cpp
@@ -62,7 +62,7 @@ JSONObject::JSONObject(const unsigned int id, const std::string& bufferName)
 
 JSONObject::JSONObject()
 {
-    _uniqueID = -1;
+    _uniqueID = 0xffffffff;
 }
 
 void JSONObject::addUniqueID()