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-rw-r--r--nixos/modules/testing/test-instrumentation.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/testing/test-instrumentation.nix b/nixos/modules/testing/test-instrumentation.nix
index 6dc4091bad1..c91e54f5a4d 100644
--- a/nixos/modules/testing/test-instrumentation.nix
+++ b/nixos/modules/testing/test-instrumentation.nix
@@ -128,7 +128,7 @@ in
     boot.consoleLogLevel = 7;
 
     # Prevent tests from accessing the Internet.
-    networking.defaultGateway = mkOverride 150 "";
+    networking.defaultGateway = mkOverride 150 null;
     networking.nameservers = mkOverride 150 [ ];
 
     system.requiredKernelConfig = with config.lib.kernelConfig; [