diff --git a/src/Utils.php b/src/Utils.php
index f8bd7b1..d0fdae6 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -162,7 +162,7 @@ class Utils {
         foreach (self::charIn($text) as $char) {
             $ord = ord($char);
             if ($ord <= ord(' ') && $ord <= ord('~')) {
-                $ret .= mb_substr(" ！゛＃＄％＆'（）＊＋、ー。／０１２３４５６７８９：；〈＝〉？＠ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺ［］＾＿‘ａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ｛|}~", $ord - ord(' '), 1);
+                $ret .= mb_substr(" ！゛＃＄％＆'（）＊＋、ー。／０１２３４５６７８９：；〈＝〉？＠ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺ［\］＾＿‘ａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ｛|}~", $ord - ord(' '), 1);
             }
             $ret .= " ";
         }