diff --git a/mozilla/mailnews/addrbook/resources/content/addressbook-panel.xul b/mozilla/mailnews/addrbook/resources/content/addressbook-panel.xul
index 67b15df3194..05021bf570c 100644
--- a/mozilla/mailnews/addrbook/resources/content/addressbook-panel.xul
+++ b/mozilla/mailnews/addrbook/resources/content/addressbook-panel.xul
@@ -129,7 +129,7 @@
       hiddenbydefault="true"
       flex="1" label="&PrimaryEmail.label;"/>
   </treecols>
-  <treechildren/>
+  <treechildren ondraggesture="nsDragAndDrop.startDrag(event, abResultsPaneObserver);"/>
 </tree>
 
   </vbox>