diff --git a/src/Fetch/Message.php b/src/Fetch/Message.php
old mode 100755
new mode 100644
index dc76535..27c3dc8
--- a/src/Fetch/Message.php
+++ b/src/Fetch/Message.php
@@ -597,6 +597,10 @@ class Message
             return $converted;
         }
 
+        if ($to === 'utf-8') {
+            return UTF8::fix($text);
+        }
+
         return null;
     }
 
diff --git a/tests/Fetch/Test/MIMETest.php b/tests/Fetch/Test/MIMETest.php
index 3fc8c26..1685f5c 100644
--- a/tests/Fetch/Test/MIMETest.php
+++ b/tests/Fetch/Test/MIMETest.php
@@ -34,6 +34,10 @@ class MIMETest extends \PHPUnit_Framework_TestCase
                 . PHP_EOL .
                 '=?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?='
             ),
+            array(
+                'ab11 ? ?????.jpg',
+                "\x61\x62\x31\x31\x20\x97\x20\x3f\x3f\x3f\x3f\x3f\x2e\x6a\x70\x67",
+            ),
             array(
                 '?????? ?????.pdf',
                 '=?UTF-8?B?' .base64_encode("\xCF\xF0\xE8\xEC\xE5\xF0 \xEF\xEB\xE0\xED\xE0\x2E\x70\x64\x66") . '?=',