diff --git a/virtualmin-nginx-lib.pl b/virtualmin-nginx-lib.pl
index 580612b..4791b5c 100644
--- a/virtualmin-nginx-lib.pl
+++ b/virtualmin-nginx-lib.pl
@@ -1063,6 +1063,8 @@ sub nginx_access_parse
 		&check_ipaddress($addr) ||
 		   $addr =~ /^(\S+)\/(\d+)$/ &&
 		     &check_ipaddress("$1") && $2 > 0 && $2 <= 32 ||
+		&check_ip6address($addr) ||
+		   $addr =~ /^(\S+)\/(\d+)$/ && &check_ip6address("$1") ||
 			&error(&text('access_eaddr', $addr));
 		}
 	push(@obj, { 'name' => $mode,