diff --git a/src/Tpl.php b/src/Tpl.php
index 6b49137..76a57e4 100644
--- a/src/Tpl.php
+++ b/src/Tpl.php
@@ -272,8 +272,8 @@ class Tpl {
     }
     else {
       $function = new \ReflectionFunction($callable);
-      $default_smarty_function_name = "smarty_$function";
-      $default_smarty_name = $callable;
+      $default_smarty_function_name = sprintf("smarty_%s", $function->getName());
+      $default_smarty_name = $function->getName();
       $callable_txt = $callable;
       $params = $function->getParameters();
     }