diff --git a/nixos/tests/corerad.nix b/nixos/tests/corerad.nix
index 37a1e90477a8..638010f92f44 100644
--- a/nixos/tests/corerad.nix
+++ b/nixos/tests/corerad.nix
@@ -80,7 +80,7 @@ import ./make-test-python.nix (
           ), "SLAAC temporary address was not configured on client after router advertisement"
 
       with subtest("Verify HTTP debug server is configured"):
-          out = router.succeed("curl localhost:9430/metrics")
+          out = router.succeed("curl -f localhost:9430/metrics")
 
           assert (
               "corerad_build_info" in out