diff --git a/nixos/tests/prometheus-exporters.nix b/nixos/tests/prometheus-exporters.nix
index ef356dbc7bb1..bb1187cdabc7 100644
--- a/nixos/tests/prometheus-exporters.nix
+++ b/nixos/tests/prometheus-exporters.nix
@@ -1546,12 +1546,12 @@ let
         wait_for_open_port(9374)
         wait_until_succeeds(
             "curl -sSf localhost:9374/metrics | grep '{}' | grep -v ' 0$'".format(
-                'smokeping_requests_total{host="127.0.0.1",ip="127.0.0.1",source=""} '
+                'smokeping_requests_total{host="127.0.0.1",ip="127.0.0.1",source="",tos="0"} '
             )
         )
         wait_until_succeeds(
             "curl -sSf localhost:9374/metrics | grep '{}'".format(
-                'smokeping_response_ttl{host="127.0.0.1",ip="127.0.0.1",source=""}'
+                'smokeping_response_ttl{host="127.0.0.1",ip="127.0.0.1",source="",tos="0"}'
             )
         )
       '';