diff --git a/machine/backyard/filesystems.nix b/machine/backyard/filesystems.nix
index 1aab849..8a2a959 100644
--- a/machine/backyard/filesystems.nix
+++ b/machine/backyard/filesystems.nix
@@ -1,7 +1,7 @@
 { config, lib, pkgs, modulesPath, ... }:
 let
   zfsMount = dev: { device = dev; fsType = "zfs"; options = [ "nofail" ]; };
-  bindMount = dev: { device = dev; options = [ "bind" "nofail" ]; };
+  bindMount = dev: { device = dev; options = [ "bind" "nofail" "ro" ]; };
 in
 {
   fileSystems = {