diff --git a/lib/NGCP/Panel/Form/PeeringRule.pm b/lib/NGCP/Panel/Form/PeeringRule.pm
index b1b6e88277..6fc96e4aa8 100644
--- a/lib/NGCP/Panel/Form/PeeringRule.pm
+++ b/lib/NGCP/Panel/Form/PeeringRule.pm
@@ -18,6 +18,7 @@ has_field 'callee_prefix' => (
         rel => ['tooltip'],
         title => ['Callee prefix, eg: 43']
     },
+    maxlength => 16,
 );
 
 has_field 'callee_pattern' => (