diff --git a/htdocs/core/lib/functions2.lib.php b/htdocs/core/lib/functions2.lib.php
index 6b51cf76150..188b30116d7 100644
--- a/htdocs/core/lib/functions2.lib.php
+++ b/htdocs/core/lib/functions2.lib.php
@@ -178,9 +178,9 @@ function dol_print_file($langs, $filename, $searchalt = 0)
 				$content = file_get_contents($formfilealt);
 				$isutf8 = utf8_check($content);
 				if (!$isutf8 && $conf->file->character_set_client == 'UTF-8') {
-					print utf8_encode($content);
+					print mb_convert_encoding($content, 'UTF-8', 'ISO-8859-1');
 				} elseif ($isutf8 && $conf->file->character_set_client == 'ISO-8859-1') {
-					print utf8_decode($content);
+					print mb_convert_encoding($content, 'ISO-8859-1', 'UTF-8');
 				} else {
 					print $content;
 				}