diff --git a/nixos/linux.nix b/nixos/linux.nix
index c9cf284..c027f4b 100644
--- a/nixos/linux.nix
+++ b/nixos/linux.nix
@@ -171,9 +171,12 @@ in {
       "sync.io" = {
         autoStart = true;
         image = "quineglobal/sync.io@sha256:cbb180301fde42d8d22c26c952a4d4a487469d6491465302d8d79ebf194813b3";
-        volumes = [ ];
+        volumes = [
+          "/var/syncio-cache:/sync.io-cache"
+        ];
         environment = {};
         ports = ["9090:8080"];
+        user = "0"; # run as root
       };
     };
   };