diff --git a/config.js b/config.js
index ee62ce8d..b2d17897 100644
--- a/config.js
+++ b/config.js
@@ -14,7 +14,8 @@ module.exports = {
   APP_VERSION: APP_VERSION,
   APP_WINDOW_TITLE: APP_NAME + ' (BETA)',
 
-  AUTO_UPDATE_URL: 'https://webtorrent.io/desktop/update?version=' + APP_VERSION,
+  AUTO_UPDATE_URL: 'https://webtorrent.io/desktop/update' +
+    '?version=' + APP_VERSION + '&platform=' + process.platform,
   AUTO_UPDATE_CHECK_STARTUP_DELAY: 5 * 1000 /* 5 seconds */,
 
   CRASH_REPORT_URL: 'https://webtorrent.io/desktop/crash-report',