diff --git a/Classes/PHPExcel/Shared/String.php b/Classes/PHPExcel/Shared/String.php
index fa1a64e05..b7b8c7591 100644
--- a/Classes/PHPExcel/Shared/String.php
+++ b/Classes/PHPExcel/Shared/String.php
@@ -486,14 +486,14 @@ public static function UTF8toBIFF8UnicodeLong($value)
      */
     public static function ConvertEncoding($value, $to, $from)
     {
-        if (self::getIsIconvEnabled()) {
-            return iconv($from, $to, $value);
-        }
-
         if (self::getIsMbstringEnabled()) {
             return mb_convert_encoding($value, $to, $from);
         }
 
+        if (self::getIsIconvEnabled()) {
+            return iconv($from, $to, $value);
+        }
+
         if ($from == 'UTF-16LE') {
             return self::utf16_decode($value, false);
         } elseif ($from == 'UTF-16BE') {