diff --git a/src/bind.inc.php b/src/bind.inc.php
index c3f0f67..1ab65c7 100644
--- a/src/bind.inc.php
+++ b/src/bind.inc.php
@@ -205,7 +205,7 @@ function add_twig_support(\Twig\Environment $twig)
         if($arg->hasToken('default'))
           ++$def_args_num;
         else if($def_args_num > 0)
-          throw new Exception("Field '{$name}' in {$fn->getName()} is expected to be tagged with @default");
+          throw new Exception("Field '{$arg->getName()}' in {$fn->getName()} is expected to be tagged with @default");
       }
       return $def_args_num;
     }