diff --git a/htdocs/admin/tools/listevents.php b/htdocs/admin/tools/listevents.php
index 00c4bdc36dd..78a3f8948d4 100644
--- a/htdocs/admin/tools/listevents.php
+++ b/htdocs/admin/tools/listevents.php
@@ -92,7 +92,15 @@ $date_endday = $tmp['mday'];
 $date_endmonth = $tmp['mon'];
 $date_endyear = $tmp['year'];
 
-$arrayfields = array();
+// Add prefix session
+$arrayfields = array(
+	'e.prefix_session' => array(
+		'label'=>'UserAgent',
+		'checked'=>(empty($conf->global->AUDIT_ENABLE_PREFIX_SESSION) ? 0 : 1),
+		'enabled'=>(empty($conf->global->AUDIT_ENABLE_PREFIX_SESSION) ? 0 : 1),
+		'position'=>110
+	)
+);
 
 
 /*
diff --git a/htdocs/langs/en_US/other.lang b/htdocs/langs/en_US/other.lang
index 011352f1dcd..0a7b3723ab1 100644
--- a/htdocs/langs/en_US/other.lang
+++ b/htdocs/langs/en_US/other.lang
@@ -259,7 +259,8 @@ ContactCreatedByEmailCollector=Contact/address created by email collector from e
 ProjectCreatedByEmailCollector=Project created by email collector from email MSGID %s
 TicketCreatedByEmailCollector=Ticket created by email collector from email MSGID %s
 OpeningHoursFormatDesc=Use a - to separate opening and closing hours.<br>Use a space to enter different ranges.<br>Example: 8-12 14-18
- 
+PrefixSession=Prefix for session ID
+
 ##### Export #####
 ExportsArea=Exports area
 AvailableFormats=Available formats