diff --git a/js/twitter.js b/js/twitter.js
index 3734e0b..fe0fc62 100644
--- a/js/twitter.js
+++ b/js/twitter.js
@@ -17,8 +17,15 @@
         var script = document.createElement("script");
         script.src = '//platform.twitter.com/widgets.js';
         document.head.appendChild(script);
+
+        script.onload = function() {
+          // twttr is defined only when widgets.js is loaded.
+          _init();
+        };
+      }
+      else {
+        _init();
       }
-      _init();
     }
   };