diff --git a/calendar/inc/class.calendar_uiforms.inc.php b/calendar/inc/class.calendar_uiforms.inc.php
index 5ee36a63a9..6b36462f76 100644
--- a/calendar/inc/class.calendar_uiforms.inc.php
+++ b/calendar/inc/class.calendar_uiforms.inc.php
@@ -1739,9 +1739,11 @@ class calendar_uiforms extends calendar_ui
 			$lock_path = Vfs::app_entry_lock_path('calendar',$event['id']);
 			$lock_owner = 'mailto:'.$GLOBALS['egw_info']['user']['account_email'];
 
+			$scope = 'shared';
+			$type = 'write';
 			if (($preserv['lock_token'] = $event['lock_token']))		// already locked --> refresh the lock
 			{
-				Vfs::lock($lock_path,$preserv['lock_token'],$locktime,$lock_owner,$scope='shared',$type='write',true,false);
+				Vfs::lock($lock_path,$preserv['lock_token'],$locktime,$lock_owner,$scope,$type,true,false);
 			}
 			if (($lock = Vfs::checkLock($lock_path)) && $lock['owner'] != $lock_owner)
 			{
@@ -1753,7 +1755,7 @@ class calendar_uiforms extends calendar_ui
 			{
 				$preserv['lock_token'] = $lock['token'];
 			}
-			elseif(Vfs::lock($lock_path,$preserv['lock_token'],$locktime,$lock_owner,$scope='shared',$type='write',false,false))
+			elseif(Vfs::lock($lock_path,$preserv['lock_token'],$locktime,$lock_owner,$scope,$type,false,false))
 			{
 				//We handle AJAX_REQUEST in client-side for unlocking the locked entry, in case of closing the entry by X button or close button
 			}