diff --git a/includes/unicode.inc b/includes/unicode.inc
index f9684a8..4002618 100644
--- a/includes/unicode.inc
+++ b/includes/unicode.inc
@@ -388,17 +388,7 @@ function truncate_utf8($string, $max_length, $wordsafe = FALSE, $add_ellipsis =
  */
 function mime_header_encode($string) {
   if (preg_match('/[^\x20-\x7E]/', $string)) {
-    $chunk_size = 47; // floor((75 - strlen("=?UTF-8?B??=")) * 0.75);
-    $len = strlen($string);
-    $output = '';
-    while ($len > 0) {
-      $chunk = drupal_truncate_bytes($string, $chunk_size);
-      $output .= ' =?UTF-8?B?' . base64_encode($chunk) . "?=\n";
-      $c = strlen($chunk);
-      $string = substr($string, $c);
-      $len -= $c;
-    }
-    return trim($output);
+    $string = '=?UTF-8?B?'. base64_encode($string) ."?=";
   }
   return $string;
 }