diff --git a/preferences.xml b/preferences.xml
index 2bb1811aa..43afc6b90 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -158,7 +158,6 @@ Started September 2000 by David Megginson, david@megginson.com
 
       <at-model type="bool">true</at-model>
       <at-model-idx type="int">0</at-model-idx>
-      <at-model-alt-damping type="double">0.0</at-model-alt-damping>
       <at-model-roll-damping type="double">1.8</at-model-roll-damping>
       <at-model-pitch-damping type="double">1.8</at-model-pitch-damping>
       <at-model-heading-damping type="double">1.8</at-model-heading-damping>