diff --git a/nixos/server/package-configs/firefox-sync/default.nix b/nixos/server/package-configs/firefox-sync/default.nix
index 6b83ed9..db2b6ed 100644
--- a/nixos/server/package-configs/firefox-sync/default.nix
+++ b/nixos/server/package-configs/firefox-sync/default.nix
@@ -10,6 +10,7 @@ in {
 
   users.users.firefox-syncserver = {
     isSystemUser = true;
+    group = "firefox-syncserver";
     extraGroups = [config.users.groups.keys.name];
   };