diff --git a/roles/prometheus/templates/blackbox.yml b/roles/prometheus/templates/blackbox.yml
index cd7b6fe..d53df08 100644
--- a/roles/prometheus/templates/blackbox.yml
+++ b/roles/prometheus/templates/blackbox.yml
@@ -175,7 +175,6 @@ modules:
       {% if blackbox_prefer_ipv4 -%}
       preferred_ip_protocol: ip4
       {% endif -%}
-      tls: true
       query_response:
         - expect: ".*SIEVE*"
         - expect: "^OK .*$"
@@ -187,7 +186,6 @@ modules:
       {% if blackbox_prefer_ipv4 -%}
       preferred_ip_protocol: ip4
       {% endif -%}
-      tls: true
       query_response:
         - expect: ".*SIEVE*"
         - expect: "^OK .*$"