diff --git a/preferences.xml b/preferences.xml
index e72744c5d..707b221c5 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -538,6 +538,7 @@ Started September 2000 by David Megginson, david@megginson.com
   <traffic-manager>
      <enabled type="bool">true</enabled>
      <instantaneous-action type="bool">false</instantaneous-action>
+     <use-custom-scenery-data type="bool">true</use-custom-scenery-data>
      <proportion>1.0</proportion>
   </traffic-manager>