diff --git a/doc/sh_main.js b/doc/sh_main.js
index 1d59dc7dcf..27905696c8 100644
--- a/doc/sh_main.js
+++ b/doc/sh_main.js
@@ -547,6 +547,7 @@ function highlight(prefix, suffix, tag) {
 
 
 function sh_highlightDocument(prefix, suffix) {
+  highlight(prefix, suffix, 'tt');
   highlight(prefix, suffix, 'code');
   highlight(prefix, suffix, 'pre');
 }