diff --git a/phpgwapi/inc/class.uiaccountsel.inc.php b/phpgwapi/inc/class.uiaccountsel.inc.php
index cc1c53dda0..ec3a26bf8e 100644
--- a/phpgwapi/inc/class.uiaccountsel.inc.php
+++ b/phpgwapi/inc/class.uiaccountsel.inc.php
@@ -180,9 +180,12 @@ class uiaccountsel
 					));
 				}
 				// make sure everything in $selected is also in $select, as in the other account-selection methods
-				if ($selected && ($missing = array_diff($selected,$select)))
+				if ($selected && ($missing = array_diff_key($selected,$select)))
 				{
-					$select = array_merge($missing,$select);
+					foreach($missing as $k => $v)	// merge missing (cant use array_merge, because of nummeric keys!)
+					{
+						$select[$k] = $v;
+					}
 				}
 				break;
 		}