diff --git a/roles/knot/templates/etc/knot/knot.conf.j2 b/roles/knot/templates/etc/knot/knot.conf.j2
index c7e4c4c..03eebd9 100644
--- a/roles/knot/templates/etc/knot/knot.conf.j2
+++ b/roles/knot/templates/etc/knot/knot.conf.j2
@@ -107,7 +107,6 @@ policy:
     nsec3: {{ knot_dnssec_policy_nsec3 }}
     ksk-size: {{ knot_dnssec_policy_ksk_size }}
     zsk-size: {{ knot_dnssec_policy_zsk_size }}
-    zsk-size: {{ knot_dnssec_policy_zsk_size }}
     zsk-lifetime: {{ zone.zsk_lifetime | default(knot_dnssec_policy_zsk_lifetime) }}
     ksk-lifetime: {{ zone.ksk_lifetime | default(knot_dnssec_policy_ksk_lifetime) }}
     ksk-submission: submission-{{ zone.name }}