diff --git a/resources/compiled_coffeescript.zip b/resources/compiled_coffeescript.zip
index 40c276e6be..207d5b8c81 100644
Binary files a/resources/compiled_coffeescript.zip and b/resources/compiled_coffeescript.zip differ
diff --git a/src/calibre/ebooks/oeb/display/mathjax.coffee b/src/calibre/ebooks/oeb/display/mathjax.coffee
index d7cdf2ea00..c6f8d0f9df 100644
--- a/src/calibre/ebooks/oeb/display/mathjax.coffee
+++ b/src/calibre/ebooks/oeb/display/mathjax.coffee
@@ -33,8 +33,11 @@ class MathJax
 
         script.type = 'text/javascript'
         script.onerror = (ev) ->
-            console.log('Failed to load MathJax script: ' + ev.targt.src)
-        script.src = this.base + '/MathJax.js'
+            console.log('Failed to load MathJax script: ' + ev.target.src)
+        base = this.base
+        if base.substr(base.length - 1) != '/'
+            base += '/'
+        script.src = base + 'MathJax.js'
         script.text = user_config + ('''
         MathJax.Hub.signal.Interest(function (message) {if (String(message).match(/error/i)) {console.log(message)}});
         MathJax.Hub.Config({