diff --git a/NEWS b/NEWS
index 10a3737c1..810bdf358 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@ Enhancements
  - Improve sync speed from Outlook by non-reprocessing already downloaded unread mails
 
 Bug fixes
+ - Fix setting permissions for a folder with several users
  - Fix reception of calendar event invitations on optional attendees
  - Fix server side crash parsing rtf without color table
  - Weekly recurring events created in SOGo web interface are now shown in Outlook
diff --git a/OpenChange/MAPIStoreFolder.m b/OpenChange/MAPIStoreFolder.m
index 19c826d7f..0d862b85e 100644
--- a/OpenChange/MAPIStoreFolder.m
+++ b/OpenChange/MAPIStoreFolder.m
@@ -1745,10 +1745,12 @@ Class NSExceptionK, MAPIStoreFAIMessageK, MAPIStoreMessageTableK, MAPIStoreFAIMe
 
   aclFolder = [self aclFolder];
 
-  users = [aclFolder aclUsers];
+  users = [[aclFolder aclUsers] copy];
   max = [users count];
   for (count = 0; count < max; count++)
     [aclFolder removeUserFromAcls: [users objectAtIndex: count]];
+
+  [users release];
 }
 
 - (int) modifyPermissions: (struct PermissionData *) permissions