diff --git a/src/config.ts b/src/config.ts
index ae0a443..e4b4089 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -26,6 +26,7 @@ switch (os.platform()) {
 config.inject({
   "core.confDir": configDir,
   "core.port": 8080,
+  "core.relayPort": 0,
   "core.appPort": 80,
   "core.logLevel": "info",
   "core.pluginDir": path.resolve(configDir, "..", "plugins"),
diff --git a/src/modules/relay.ts b/src/modules/relay.ts
index a0d82fa..6990852 100644
--- a/src/modules/relay.ts
+++ b/src/modules/relay.ts
@@ -29,5 +29,11 @@ export async function start() {
     relay(dht, new Stream(false, connection.socket));
   });
 
-  await relayServer.listen({ port: config.uint("core.port"), host: "0.0.0.0" });
+  let port = config.uint("core.relayPort");
+
+  if (!port) {
+    port = config.uint("core.port");
+  }
+
+  await relayServer.listen({ port, host: "0.0.0.0" });
 }