diff --git a/src/osgViewer/CompositeViewer.cpp b/src/osgViewer/CompositeViewer.cpp
index 729e99244..adb036819 100644
--- a/src/osgViewer/CompositeViewer.cpp
+++ b/src/osgViewer/CompositeViewer.cpp
@@ -24,6 +24,10 @@ CompositeViewer::~CompositeViewer()
 {
 }
 
+void CompositeViewer::init()
+{
+}
+
 void CompositeViewer::frame()
 {
     osg::notify(osg::NOTICE)<<"CompositeViewer::frame() not implemented yet."<<std::endl;