diff --git a/src/Wuunder/Util/Helper.php b/src/Wuunder/Util/Helper.php
index 49560bc..f0a9b6d 100644
--- a/src/Wuunder/Util/Helper.php
+++ b/src/Wuunder/Util/Helper.php
@@ -90,7 +90,7 @@ public function translate($val)
     private function _startsWithUpper($str)
     {
         $chr = mb_substr($str, 0, 1, "UTF-8");
-        return mb_strtolower($chr, "UTF-8") != $chr;
+        return ctype_upper($chr);
     }