diff --git a/kia-lib/src/main/kotlin/com/faforever/ice/peering/CoturnServer.kt b/kia-lib/src/main/kotlin/com/faforever/ice/peering/CoturnServer.kt
index ed828d0..217606d 100644
--- a/kia-lib/src/main/kotlin/com/faforever/ice/peering/CoturnServer.kt
+++ b/kia-lib/src/main/kotlin/com/faforever/ice/peering/CoturnServer.kt
@@ -9,5 +9,12 @@ data class CoturnServer(
     val username: String? = null,
     val credential: String? = null,
 ) {
-    fun toUDPTransport() = TransportAddress(uri.host, uri.port, Transport.UDP)
+    companion object {
+        const val DEFAULT_PORT = 3478
+    }
+
+    fun toUDPTransport() = TransportAddress(
+        uri.host,
+        if(uri.port == -1) DEFAULT_PORT else uri.port,
+        Transport.UDP)
 }