diff --git a/builds/any/rootfs/wheezy/common/overlay/etc/mtab.yml b/builds/any/rootfs/wheezy/common/overlay/etc/mtab.yml
index 51ca0f49..598e4c69 100644
--- a/builds/any/rootfs/wheezy/common/overlay/etc/mtab.yml
+++ b/builds/any/rootfs/wheezy/common/overlay/etc/mtab.yml
@@ -9,7 +9,7 @@ mounts:
     dir: /mnt/onl/data
 
   ONL-CONFIG:
-    mount: false
+    mount: ro
     dir: /mnt/onl/config
     fsck: true