diff --git a/lib/service.c b/lib/service.c
index fc62c4fa..d39e8bca 100644
--- a/lib/service.c
+++ b/lib/service.c
@@ -496,7 +496,7 @@ lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd)
 	case LWS_CONNMODE_SERVER_LISTENER:
 	case LWS_CONNMODE_SSL_ACK_PENDING:
 		n = lws_server_socket_service(context, wsi, pollfd);
-		if (n < 0)
+		if (n)
 			goto close_and_handled;
 		pending = lws_ssl_pending(wsi);
 		if (pending)