diff --git a/vendor/symfony/polyfill-iconv/Iconv.php b/vendor/symfony/polyfill-iconv/Iconv.php
index 8a1e074..43bcc38 100644
--- a/vendor/symfony/polyfill-iconv/Iconv.php
+++ b/vendor/symfony/polyfill-iconv/Iconv.php
@@ -440,7 +440,7 @@ public static function strlen1($s, $encoding = null)
             return false;
         }
 
-        return strlen(utf8_decode($s));
+        return mb_strlen($s, 'UTF-8');
     }
 
     public static function strlen2($s, $encoding = null)