diff --git a/include/ws_functions/pwg.php b/include/ws_functions/pwg.php
index 6edb841d6..88b7c02e8 100644
--- a/include/ws_functions/pwg.php
+++ b/include/ws_functions/pwg.php
@@ -327,7 +327,7 @@ function ws_session_getStatus($params, &$service)
   list($dbnow) = pwg_db_fetch_row(pwg_query('SELECT NOW();'));
   $res['current_datetime'] = $dbnow;
   $res['version'] = PHPWG_VERSION;
-  $res['available_sizes'] = implode(',', array_keys(ImageStdParams::get_defined_type_map()));
+  $res['available_sizes'] = array_keys(ImageStdParams::get_defined_type_map());
 
   if (is_admin())
   {