diff --git a/roles/base/files/postfix/main.cf/main.cf.mailman b/roles/base/files/postfix/main.cf/main.cf.mailman
index c11a6854c4..c8f70d9f9a 100644
--- a/roles/base/files/postfix/main.cf/main.cf.mailman
+++ b/roles/base/files/postfix/main.cf/main.cf.mailman
@@ -696,5 +696,5 @@ local_recipient_maps = hash:/var/lib/mailman3/data/postfix_lmtp
 relay_domains = hash:/var/lib/mailman3/data/postfix_domains
 
 smtpd_sender_restrictions =
-	check_sender_access /etc/postfix/sender_access
+	check_sender_access hash:/etc/postfix/sender_access
 	permit