diff --git a/modules/nixos-modules/sync.nix b/modules/nixos-modules/sync.nix
index 8915dc8..bf43041 100644
--- a/modules/nixos-modules/sync.nix
+++ b/modules/nixos-modules/sync.nix
@@ -11,6 +11,7 @@ in {
     {
       systemd = lib.mkIf config.services.syncthing.enable {
         tmpfiles.rules = [
+          "A ${mountDir} -    -        -               - u:syncthing:rwX,g:syncthing:rwX,o::-"
           "d ${mountDir} 2755 syncthing syncthing -"
           "d ${config.services.syncthing.dataDir} 775 syncthing syncthing -"
           "d ${config.services.syncthing.configDir} 755 syncthing syncthing -"