diff --git a/phpgwapi/inc/class.groupdav_handler.inc.php b/phpgwapi/inc/class.groupdav_handler.inc.php
index 429f408aa5..1bbadffd79 100644
--- a/phpgwapi/inc/class.groupdav_handler.inc.php
+++ b/phpgwapi/inc/class.groupdav_handler.inc.php
@@ -365,7 +365,7 @@ class groupdav_propfind_iterator implements Iterator
 	 * Number of entries queried from callback in one call
 	 *
 	 */
-	const CHUNK_SIZE = 100;
+	const CHUNK_SIZE = 500;
 
 	/**
 	 * Constructor