diff --git a/src/osgViewer/CompositeViewer.cpp b/src/osgViewer/CompositeViewer.cpp
index 8b560143b..c52067c4c 100644
--- a/src/osgViewer/CompositeViewer.cpp
+++ b/src/osgViewer/CompositeViewer.cpp
@@ -402,6 +402,8 @@ void CompositeViewer::getCameras(Cameras& cameras, bool onlyActive)
  
 void CompositeViewer::getScenes(Scenes& scenes, bool onlyValid)
 {
+    scenes.clear();
+
     typedef std::set<osgViewer::Scene*> SceneSet;
     SceneSet sceneSet;
 
@@ -423,6 +425,8 @@ void CompositeViewer::getScenes(Scenes& scenes, bool onlyValid)
 
 void CompositeViewer::getViews(Views& views, bool onlyValid)
 {
+    views.clear();
+
     for(RefViews::iterator vitr = _views.begin();
         vitr != _views.end();
         ++vitr)
@@ -433,6 +437,8 @@ void CompositeViewer::getViews(Views& views, bool onlyValid)
 
 void CompositeViewer::getAllThreads(Threads& threads, bool onlyActive)
 {
+    threads.clear();
+
     OperationThreads operationThreads;
     getOperationThreads(operationThreads);
     
diff --git a/src/osgViewer/Viewer.cpp b/src/osgViewer/Viewer.cpp
index 569f22434..1968a15b8 100644
--- a/src/osgViewer/Viewer.cpp
+++ b/src/osgViewer/Viewer.cpp
@@ -994,11 +994,13 @@ void Viewer::updateTraversal()
 
 void Viewer::getScenes(Scenes& scenes, bool onlyValid)
 {
+    scenes.clear();
     scenes.push_back(_scene.get());
 }
 
 void Viewer::getViews(Views& views, bool onlyValid)
 {
+    views.clear();
     views.push_back(this);
 }