diff --git a/include/osgDB/Registry b/include/osgDB/Registry
index 91b989941..18e8541a1 100644
--- a/include/osgDB/Registry
+++ b/include/osgDB/Registry
@@ -458,6 +458,7 @@ class OSGDB_EXPORT Registry : public osg::Referenced
         struct ReadArchiveFunctor;
         
         // make helper classes friends to get round VS6.0 "issues"
+        friend struct ReadFunctor;
         friend struct RegReadObjectFunctor;
         friend struct ReadImageFunctor;
         friend struct ReadHeightFieldFunctor;