diff --git a/src/osgViewer/Viewer.cpp b/src/osgViewer/Viewer.cpp
index 148ebc879..e572fa412 100644
--- a/src/osgViewer/Viewer.cpp
+++ b/src/osgViewer/Viewer.cpp
@@ -687,7 +687,7 @@ int Viewer::run()
         return 1;
     }
 
-    if (!getCameraManipulator())
+    if (!getCameraManipulator() && getCamera()->getAllowEventFocus())
     {
         setCameraManipulator(new osgGA::TrackballManipulator());
     }