diff --git a/services/monitoring/blackbox.nix b/services/monitoring/blackbox.nix
index 97b204e..bcc7308 100644
--- a/services/monitoring/blackbox.nix
+++ b/services/monitoring/blackbox.nix
@@ -39,6 +39,7 @@ in
           http:
             fail_if_not_ssl: true
             preferred_ip_protocol: ip4
+            valid_status_codes: []  # Accept any status, we only care about TLS
     '';
   };