diff --git a/preferences.xml b/preferences.xml
index 43e1edae4..fac18e1db 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -498,7 +498,7 @@ Started September 2000 by David Megginson, david@megginson.com
   <traffic-manager>
      <enabled type="bool">true</enabled>
      <instantaneous-action type="bool">false</instantaneous-action>
-     <proportion>0.9</proportion>
+     <proportion>1.0</proportion>
   </traffic-manager>
 
   <ai>