diff --git a/server.go b/server.go
index 66e2a00..c5430c7 100644
--- a/server.go
+++ b/server.go
@@ -134,7 +134,7 @@ func RegisterProxy(instance, service, domain string, port int, host, ip string,
 	} else if ipv4 := ipAddr.To4(); ipv4 != nil {
 		entry.AddrIPv4 = ipAddr
 	} else if ipv6 := ipAddr.To16(); ipv6 != nil {
-		entry.AddrIPv4 = ipAddr
+		entry.AddrIPv6 = ipAddr
 	} else {
 		return nil, fmt.Errorf("The IP is neither IPv4 nor IPv6: %#v", ipAddr)
 	}