diff --git a/js/main.js b/js/main.js
index 9c489ee0..984df4fd 100644
--- a/js/main.js
+++ b/js/main.js
@@ -136,7 +136,7 @@ var MM = (function() {
 		var contentNeedsUpdate = false;
 
 		if (headerWrapper.length > 0) {
-			headerNeedsUpdate = newHeader !== headerWrapper.innerHTML;
+			headerNeedsUpdate = newHeader !== headerWrapper[0].innerHTML;
 		}
 
 		var tempContentWrapper = document.createElement("div");