diff --git a/include/osgDB/DatabasePager b/include/osgDB/DatabasePager
index faf874395..6fa19a80e 100644
--- a/include/osgDB/DatabasePager
+++ b/include/osgDB/DatabasePager
@@ -128,7 +128,7 @@ class OSGDB_EXPORT DatabasePager : public osg::NodeVisitor::DatabaseRequestHandl
         
         void setUpThreads(unsigned int totalNumThreads=2, unsigned int numHttpThreads=1);
 
-        unsigned int addDatabaseThread(DatabaseThread::Mode mode, const std::string& name);
+        virtual unsigned int addDatabaseThread(DatabaseThread::Mode mode, const std::string& name);
 
         DatabaseThread* getDatabaseThread(unsigned int i) { return _databaseThreads[i].get(); }