--- a/mailnews/base/search/resources/content/searchTermOverlay.js
+++ b/mailnews/base/search/resources/content/searchTermOverlay.js
@@ -290,17 +290,17 @@ function updateSearchAttributes()
         gSearchTerms[i].obj.searchattribute.refreshList();
     }
 
 function booleanChanged(event) {
     // when boolean changes, we have to update all the attributes on the search terms
     var newBoolValue = (event.target.getAttribute("value") == "and") ? true : false;
     var matchAllValue = (event.target.getAttribute("value") == "matchAll") ? true : false;
     if (document.getElementById("abPopup")) {
-      var selectedAB = document.getElementById("abPopup").selectedItem.id;
+      var selectedAB = document.getElementById("abPopup").selectedItem.value;
       setSearchScope(GetScopeForDirectoryURI(selectedAB));
     }
     for (var i=0; i<gSearchTerms.length; i++) {
         var searchTerm = gSearchTerms[i].obj;
         searchTerm.booleanAnd = newBoolValue;
         searchTerm.matchAll = matchAllValue;
     }
     var searchTerms = document.getElementById("searchTermList");