diff --git a/src/osgViewer/Viewer.cpp b/src/osgViewer/Viewer.cpp
index 5fdba7f66..7302c6a76 100644
--- a/src/osgViewer/Viewer.cpp
+++ b/src/osgViewer/Viewer.cpp
@@ -673,7 +673,7 @@ int Viewer::run()
         realize();
     }
 
-#if 0
+#if 1
     while (!done())
     {
         frame();