diff --git a/phpgwapi/inc/class.translation.inc.php b/phpgwapi/inc/class.translation.inc.php
index 1a420bdc23..3583b21972 100644
--- a/phpgwapi/inc/class.translation.inc.php
+++ b/phpgwapi/inc/class.translation.inc.php
@@ -430,6 +430,9 @@ class translation
 			case 'windows-1250':
 				$from = 'iso-8859-2';
 				break;
+			case 'windows-1257':
+				$from = 'iso-8859-13';
+				break;
 		}
 		if (!$to)
 		{