diff --git a/m/tent/blackbox.yml b/m/tent/blackbox.yml
index d716359d..ccd701e8 100644
--- a/m/tent/blackbox.yml
+++ b/m/tent/blackbox.yml
@@ -3,6 +3,7 @@ modules:
     prober: http
     timeout: 5s
     http:
+      preferred_ip_protocol: "ip4"
       follow_redirects: true
       valid_status_codes: []  # Defaults to 2xx
       method: GET