diff --git a/application/Url.php b/application/Url.php
index b3759377..21c17ecc 100644
--- a/application/Url.php
+++ b/application/Url.php
@@ -260,7 +260,7 @@ public function idnToAscii()
         if (! function_exists('idn_to_ascii') || ! isset($this->parts['host'])) {
             return $out;
         }
-        $asciiHost = idn_to_ascii($this->parts['host']);
+        $asciiHost = idn_to_ascii($this->parts['host'], 0, INTL_IDNA_VARIANT_UTS46);
         return str_replace($this->parts['host'], $asciiHost, $out);
     }