diff --git a/public/_includes/_main-nav.jade b/public/_includes/_main-nav.jade
index 67c35450e2..39dfd0deb7 100644
--- a/public/_includes/_main-nav.jade
+++ b/public/_includes/_main-nav.jade
@@ -15,5 +15,5 @@ md-toolbar(class="main-nav background-regal l-pinned-top l-layer-5",scroll-y-off
       li.l-left <a class="main-nav-button" href="/translate/cn/home.html" md-button>关于中文版</a>
       li.l-right <a class="main-nav-button" href="/docs/ts/latest/quickstart.html" md-button>立即开始！</a>
       li.l-right
-        a.main-nav-button.md-button(ng-click="appCtrl.toggleSource($event)", href)
+        a.main-nav-button.md-button.ng-cloak(ng-click="appCtrl.toggleSource($event)", href)
           span {{appCtrl.sourceVisible?'Hide English':'Show English'}}