diff --git a/lib/rules.js b/lib/rules.js
index 9450fb94..7059308c 100644
--- a/lib/rules.js
+++ b/lib/rules.js
@@ -1088,7 +1088,7 @@ module.exports = [
         forEachHeading(params, function forHeading(heading, content) {
           if (!errors.length) {
             var actual = levels[heading.tag] + " " + content;
-            var expected = requiredHeaders[i++] || "";
+            var expected = requiredHeaders[i++] || "[None]";
             if (expected === "*") {
               optional = true;
             } else if (expected.toLowerCase() === actual.toLowerCase()) {