diff --git a/include/class.queue.php b/include/class.queue.php
index b4343d43eb17a622c1af41083ed79fa4cb819b3e..8526de7005006f2310744bff29abf57ae133d4d8 100644
--- a/include/class.queue.php
+++ b/include/class.queue.php
@@ -667,7 +667,7 @@ class CustomQueue extends VerySimpleModel {
                 "bits" => QueueColumn::FLAG_SORTABLE,
                 "filter" => "link:ticketP",
                 "annotations" => '[{"c":"TicketSourceDecoration","p":"b"}]',
-                "conditions" => '[{"crit":["isanswered","set",null],"prop":{"font-weight":"bold"}}]',
+                "conditions" => '[{"crit":["isanswered","nset",null],"prop":{"font-weight":"bold"}}]',
             )),
             QueueColumn::placeholder(array(
                 "id" => 2,
@@ -686,7 +686,7 @@ class CustomQueue extends VerySimpleModel {
                 "bits" => QueueColumn::FLAG_SORTABLE,
                 "filter" => "link:ticket",
                 "annotations" => '[{"c":"TicketThreadCount","p":">"},{"c":"ThreadAttachmentCount","p":"a"},{"c":"OverdueFlagDecoration","p":"<"}]',
-                "conditions" => '[{"crit":["isanswered","set",null],"prop":{"font-weight":"bold"}}]',
+                "conditions" => '[{"crit":["isanswered","nset",null],"prop":{"font-weight":"bold"}}]',
                 "truncate" => 'ellipsis',
             )),
             QueueColumn::placeholder(array(