diff --git a/src/beautifiers/prettydiff.coffee b/src/beautifiers/prettydiff.coffee
index 9971412..b020ea6 100644
--- a/src/beautifiers/prettydiff.coffee
+++ b/src/beautifiers/prettydiff.coffee
@@ -40,6 +40,7 @@ module.exports = class PrettyDiff extends Beautifier
     ERB: true
     EJS: true
     HTML: true
+    Handlebars: true
     XML: true
     SVG: true
     Spacebars: true