diff --git a/phpgwapi/inc/class.sqlfs_stream_wrapper.inc.php b/phpgwapi/inc/class.sqlfs_stream_wrapper.inc.php
index 48f046c7d9..87938dbbd8 100644
--- a/phpgwapi/inc/class.sqlfs_stream_wrapper.inc.php
+++ b/phpgwapi/inc/class.sqlfs_stream_wrapper.inc.php
@@ -1046,8 +1046,10 @@ class sqlfs_stream_wrapper implements iface_stream_wrapper
 			{
 				$memberships[] = abs($gid);	// sqlfs stores the gid's positiv
 			}
-			$sql_read_acl = '((fs_mode & 04)=04 OR (fs_mode & 0400)=0400 AND fs_uid='.(int)egw_vfs::$user.
-				' OR (fs_mode & 040)=040 AND fs_gid IN('.implode(',',$memberships).'))';
+			// using octal numbers with mysql leads to funny results (select 384 & 0400 --> 384 not 256=0400)
+			// 256 = 0400, 32 = 040
+			$sql_read_acl = '((fs_mode & 4)=4 OR (fs_mode & 256)=256 AND fs_uid='.(int)egw_vfs::$user.
+				' OR (fs_mode & 32)=32 AND fs_gid IN('.implode(',',$memberships).'))';
 		}
 		return $sql_read_acl;
 	}