diff --git a/src/apps/relay/turncli.c b/src/apps/relay/turncli.c
index ce1185b..8712493 100644
--- a/src/apps/relay/turncli.c
+++ b/src/apps/relay/turncli.c
@@ -1115,7 +1115,7 @@ static void cliserver_input_handler(struct evconnlistener *l, evutil_socket_t fd
 
 	clisession->bev = bufferevent_socket_new(cliserver.event_base,
 					fd,
-					BEV_OPT_DEFER_CALLBACKS | BEV_OPT_UNLOCK_CALLBACKS);
+					BEV_OPT_THREADSAFE | BEV_OPT_DEFER_CALLBACKS | BEV_OPT_UNLOCK_CALLBACKS);
 	bufferevent_setcb(clisession->bev, cli_socket_input_handler_bev, NULL,
 			cli_eventcb_bev, clisession);
 	bufferevent_setwatermark(clisession->bev, EV_READ|EV_WRITE, 0, BUFFEREVENT_HIGH_WATERMARK);