diff --git a/lib/main.js b/lib/main.js
index 7ed0936..960abf5 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -269,6 +269,7 @@ exports.mjpage = function(htmlstring, configOptions, typesetOptions, callback) {
                 if (config.fragment) output = document.body.innerHTML;
                 else output = serializeDocument(document);
                 window.close();
+                mathjax.start();
                 callback(output);
             })
         }