diff --git a/ddclient.in b/ddclient.in
index 0653fae..8fd86ff 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -6216,7 +6216,7 @@ sub nic_hetzner_update {
                 $config{$domain}{"status-ipv$ipv"} = 'failed';
 
                 # Get DNS 'A' or 'AAAA' record ID
-                $url = "https://$config{$key}{'server'}/records?$zone_id";
+                $url = "https://$config{$key}{'server'}/records?zone_id=$zone_id";
                 $reply = geturl(proxy => opt('proxy'),
                                 url => $url,
                                 headers => $headers