diff --git a/nixos.nix b/nixos.nix
index 970e85b..f5a8e81 100644
--- a/nixos.nix
+++ b/nixos.nix
@@ -80,7 +80,8 @@
 
     allowedUDPPorts = [
       2626   # Dolphin emulator
-      27015
+      11753  # OpenRCT2
+      27015  # Source games
     ];
 
     allowedTCPPortRanges = [