diff --git a/contrib/registry/consul/client.go b/contrib/registry/consul/client.go
index ed505974a..46321b8e2 100644
--- a/contrib/registry/consul/client.go
+++ b/contrib/registry/consul/client.go
@@ -98,7 +98,8 @@ func (c *Client) Register(_ context.Context, svc *registry.ServiceInstance, enab
 		}
 		addr := raw.Hostname()
 		port, _ := strconv.ParseUint(raw.Port(), 10, 16)
-		checkAddresses = append(checkAddresses, fmt.Sprintf("%s:%d", addr, port))
+
+		checkAddresses = append(checkAddresses, net.JoinHostPort(addr, strconv.FormatUint(port, 10)))
 		addresses[raw.Scheme] = api.ServiceAddress{Address: endpoint, Port: int(port)}
 	}
 	asr := &api.AgentServiceRegistration{