diff --git a/system/nixos/mastodon.nix b/system/nixos/mastodon.nix
index 23d94d5..6f0280f 100644
--- a/system/nixos/mastodon.nix
+++ b/system/nixos/mastodon.nix
@@ -98,5 +98,7 @@ in
     };
   };
 
+  users.groups.mastodon.members = config.services.nginx.user;
+
   networking.firewall.allowedTCPPorts = [ 80 ];
 }