diff --git a/lib/NGCP/Panel/Form/CallList/Subscriber.pm b/lib/NGCP/Panel/Form/CallList/Subscriber.pm
index b8c0d847f8..3922d05282 100644
--- a/lib/NGCP/Panel/Form/CallList/Subscriber.pm
+++ b/lib/NGCP/Panel/Form/CallList/Subscriber.pm
@@ -118,7 +118,7 @@ has_field 'start_time' => (
 );
 
 has_field 'duration' => (
-    type => 'PosInteger',
+    type => 'Text',
     required => 1,
     element_attr => {
         rel => ['tooltip'],