diff --git a/lib/report/html.js b/lib/report/html.js
index 485d22b5..08e3c2d6 100644
--- a/lib/report/html.js
+++ b/lib/report/html.js
@@ -495,8 +495,9 @@ Report.mix(HtmlReport, {
     standardLinkMapper: function () {
         return {
             fromParent: function (node) {
-                var relativeName = cleanPath(node.relativeName);
-
+                var relativeName = cleanPath(node.relativeName)
+                    .split('/')
+                    .map(encodeURIComponent).join('/');
                 return node.kind === 'dir' ? relativeName + 'index.html' : relativeName + '.html';
             },
             ancestorHref: function (node, num) {