diff --git a/src/osgViewer/ViewerBase.cpp b/src/osgViewer/ViewerBase.cpp
index 49967a15e..510ab3adb 100644
--- a/src/osgViewer/ViewerBase.cpp
+++ b/src/osgViewer/ViewerBase.cpp
@@ -204,7 +204,7 @@ void ViewerBase::setThreadingModel(ThreadingModel threadingModel)
 
     _threadingModel = threadingModel;
 
-    if (isRealized() && _threadingModel!=SingleThreaded) startThreading();
+    setUpThreading();
 }
 
 ViewerBase::ThreadingModel ViewerBase::suggestBestThreadingModel()