diff --git a/modules/testing/test-instrumentation.nix b/modules/testing/test-instrumentation.nix
index b70c6e03f27f..7e4bca6ed416 100644
--- a/modules/testing/test-instrumentation.nix
+++ b/modules/testing/test-instrumentation.nix
@@ -78,8 +78,8 @@ in
     services.syslogd.extraConfig = "*.* /dev/ttyS0";
 
     # Prevent tests from accessing the Internet.
-    networking.defaultGateway = mkOverride 200 {} "";
-    networking.nameservers = mkOverride 200 {} [ ];
+    networking.defaultGatewayte = mkOverride 150 {} "";
+    networking.nameservers = mkOverride 150 {} [ ];
 
     # Apply a patch to the kernel to increase the 15s CIFS timeout.
     nixpkgs.config.packageOverrides = pkgs: {