diff --git a/modules/servers/heimdall/redlib.nix b/modules/servers/heimdall/redlib.nix
index a89a4a9..bbf595f 100644
--- a/modules/servers/heimdall/redlib.nix
+++ b/modules/servers/heimdall/redlib.nix
@@ -16,6 +16,7 @@
       BIND_NETWORK = "tcp";
       BIND = "127.0.0.1:8081";
       SERVE_ROBOTS_TXT = true;
+      DIFFICULTY = 5;
     };
   };