diff --git a/preferences.xml b/preferences.xml
index ec3b28b33..a714cb827 100644
--- a/preferences.xml
+++ b/preferences.xml
@@ -714,6 +714,7 @@ Started September 2000 by David Megginson, david@megginson.com
 		<ai>
 			<enabled type="bool">true</enabled>
 			<scenario>nimitz_demo</scenario>
+                        <groundnet-cache type="bool">true</groundnet-cache>
 			<!-- <scenario>balloon_demo</scenario> -->
 			<!-- <scenario>aircraft_demo</scenario> -->
 			<!-- <scenario>refueling_demo</scenario> -->