diff --git a/inc/backend.class.php b/inc/backend.class.php
index 91441d99..3ab346d9 100644
--- a/inc/backend.class.php
+++ b/inc/backend.class.php
@@ -105,7 +105,7 @@ public static function toUTF8($string)
     {
 
         if (!self::is_utf8($string)) {
-            return utf8_encode($string);
+            return Toolbox::encodeInUtf8($string);
         }
         return $string;
     }
diff --git a/inc/backendcsv.class.php b/inc/backendcsv.class.php
index 03db5d52..a2cd3bbe 100644
--- a/inc/backendcsv.class.php
+++ b/inc/backendcsv.class.php
@@ -104,7 +104,7 @@ public static function parseLine($fic, $data, $encoding = 1)
                   //If file is ISO8859-1 : encode the data in utf8
                     case PluginDatainjectionBackend::ENCODING_ISO8859_1:
                         if (!Toolbox::seems_utf8($tmp)) {
-                            $csv[0][] = utf8_encode($tmp);
+                            $csv[0][] = Toolbox::encodeInUtf8($tmp);
                         } else {
                             $csv[0][] = $tmp;
                         }