diff --git a/src/theme/book.js b/src/theme/book.js
index 0d71a197..8731880c 100644
--- a/src/theme/book.js
+++ b/src/theme/book.js
@@ -22,6 +22,10 @@ $( document ).ready(function() {
     $('code').each(function(i, block) {
         hljs.highlightBlock(block);
     });
+    
+    // Adding the hljs class gives code blocks the color css
+    // even if highlighting doesn't apply
+    $('code').addClass('hljs');
 
     var KEY_CODES = {
         PREVIOUS_KEY: 37,