diff --git a/nixos/modules/programs/steam.nix b/nixos/modules/programs/steam.nix
index a8d1b7aefc70..5a791d0cea0f 100644
--- a/nixos/modules/programs/steam.nix
+++ b/nixos/modules/programs/steam.nix
@@ -256,7 +256,16 @@ in
       })
 
       (lib.mkIf cfg.remotePlay.openFirewall {
-        allowedTCPPorts = [ 27036 ];
+        # https://help.steampowered.com/en/faqs/view/3E3D-BE6B-787D-A5D2
+        # https://help.steampowered.com/en/faqs/view/2EA8-4D75-DA21-31EB
+        allowedTCPPorts = [
+          27036
+          27037
+        ];
+        allowedUDPPorts = [
+          10400
+          10401
+        ];
         allowedUDPPortRanges = [
           {
             from = 27031;