diff --git a/src/mode/nunjucks.js b/src/mode/nunjucks.js
index 995bc2b3575..5cede57b82d 100644
--- a/src/mode/nunjucks.js
+++ b/src/mode/nunjucks.js
@@ -5,6 +5,7 @@ var HtmlMode = require("./html").Mode;
 var NunjucksHighlightRules = require("./nunjucks_highlight_rules").NunjucksHighlightRules;
 
 var Mode = function() {
+    HtmlMode.call(this);
     this.HighlightRules = NunjucksHighlightRules;
 };