diff --git a/htdocs/lib/functions.lib.php b/htdocs/lib/functions.lib.php
index a3289207914..e045b029251 100644
--- a/htdocs/lib/functions.lib.php
+++ b/htdocs/lib/functions.lib.php
@@ -227,7 +227,7 @@ function dol_string_unaccent($str)
 		'%C3%99' => 'U','%C3%9A' => 'U',
 		'%C3%A0' => 'a','%C3%A1' => 'a','%C3%A2' => 'a',
 		'%C3%A8' => 'e','%C3%A9' => 'e','%C3%AA' => 'e','%C3%AB' => 'e',
-		'%C3%AC' => 'i','%C3%AD' => 'i',
+		'%C3%AC' => 'i','%C3%AD' => 'i','%C3%AE' => 'i',
 		'%C3%B2' => 'o','%C3%B3' => 'o',
 		'%C3%B9' => 'u','%C3%BA' => 'u'
 		);