diff --git a/lib/libwebsockets.c b/lib/libwebsockets.c
index 400f6559..b2046ba7 100644
--- a/lib/libwebsockets.c
+++ b/lib/libwebsockets.c
@@ -2380,8 +2380,8 @@ lws_json_dump_vhost(const struct lws_vhost *vh, char *buf, int len)
 			" \"port\":\"%d\",\n"
 			" \"use_ssl\":\"%d\",\n"
 			" \"sts\":\"%d\",\n"
-			" \"rx\":\"%lu\",\n"
-			" \"tx\":\"%lu\",\n"
+			" \"rx\":\"%llu\",\n"
+			" \"tx\":\"%llu\",\n"
 			" \"conn\":\"%lu\",\n"
 			" \"trans\":\"%lu\",\n"
 			" \"ws_upg\":\"%lu\",\n"
diff --git a/lib/private-libwebsockets.h b/lib/private-libwebsockets.h
index 7e131a62..23f8f4dd 100644
--- a/lib/private-libwebsockets.h
+++ b/lib/private-libwebsockets.h
@@ -658,7 +658,8 @@ struct lws_vhost {
 #ifndef LWS_NO_EXTENSIONS
 	const struct lws_extension *extensions;
 #endif
-	unsigned long rx, tx, conn, trans, ws_upgrades, http2_upgrades;
+	unsigned long long rx, tx;
+	unsigned long conn, trans, ws_upgrades, http2_upgrades;
 
 	int listen_port;
 	unsigned int http_proxy_port;