diff --git a/defaults.xml b/defaults.xml
index e0629e2a8..373778f62 100644
--- a/defaults.xml
+++ b/defaults.xml
@@ -888,7 +888,7 @@ Started September 2000 by David Megginson, david@megginson.com
       <port type="int" userarchive="y">45003</port>
     </swift>
     <mp-carriers>
-      <auto-attach type="bool" userarchive="y"></auto-attach>
+      <auto-attach type="bool" userarchive="y">true</auto-attach>
     </mp-carriers>
   </sim>
   <!-- accelerations -->