diff --git a/interface/web/dns/dns_cname_edit.php b/interface/web/dns/dns_cname_edit.php
index e2fde267d22a0008b5e30787a5af95292e11f1f6..1a180988924bd251279388cf098af2e7b4a424d7 100644
--- a/interface/web/dns/dns_cname_edit.php
+++ b/interface/web/dns/dns_cname_edit.php
@@ -48,7 +48,7 @@ class page_action extends dns_page_action {
 	protected function checkDuplicate() {
 		global $app;
 		//* Check for duplicates where IP and hostname are the same
-		$tmp = $app->db->queryOneRecord("SELECT count(id) as number FROM dns_rr WHERE (type = 'A' AND name = ? AND zone = ? and id != ?) OR (type = 'AAAA' AND name = ? AND zone = ? and id != ?) OR (type = 'CNAME' AND name = ? AND zone = ? and id != ?) OR (type = 'DNAME' AND name = ? AND zone = ? and id != ?) OR (type = 'ALIAS' AND name = ? AND zone = ? and id != ?)", $this->dataRecord["name"], $this->dataRecord["zone"], $this->id, $this->dataRecord["name"], $this->dataRecord["zone"], $this->id, $this->dataRecord["name"], $this->dataRecord["zone"], $this->id, $this->dataRecord["name"], $this->dataRecord["zone"], $this->id, $this->dataRecord["name"], $this->dataRecord["zone"], $this->id);
+		$tmp = $app->db->queryOneRecord("SELECT count(dns_rr.id) as number FROM dns_rr LEFT JOIN dns_soa ON dns_rr.zone = dns_soa.id WHERE (( name = replace(?, concat('.', dns_soa.origin), '') or name = ? or name = concat(?,'.', dns_soa.origin)) and dns_rr.id != ? and dns_rr.zone = ?)", $this->dataRecord["name"], $this->dataRecord["name"], $this->dataRecord["name"], $this->dataRecord["zone"], $this->id, $this->dataRecord["zone"]);
 		if($tmp['number'] > 0) return true;
 		return false;
 	}