diff --git a/src/theme/book.js b/src/theme/book.js
index 297f53600d..0754fee790 100644
--- a/src/theme/book.js
+++ b/src/theme/book.js
@@ -3,6 +3,8 @@ $( document ).ready(function() {
     // url
     var url = window.location.pathname;
 
+    // Fix back button cache problem
+    window.onunload = function(){};
 
     // Set theme
     var theme = localStorage.getItem('theme');