diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index f00ce9a..184914e 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -25,7 +25,7 @@
 
   networking.hostName = "TARS";
   networking.networkmanager.enable = true;
-  networking.firewall.checkReversePath = "loose";
+  networking.firewall.checkReversePath = "strict";
   networking.firewall.allowedTCPPorts = [ 53317 ];
   networking.firewall.allowedUDPPorts = [ 53317 ];