diff --git a/app/assets/javascripts/dropzone_input.js.coffee b/app/assets/javascripts/dropzone_input.js.coffee
index a0dcaa8c27a..6f789e668af 100644
--- a/app/assets/javascripts/dropzone_input.js.coffee
+++ b/app/assets/javascripts/dropzone_input.js.coffee
@@ -167,6 +167,7 @@ class @DropzoneInput
           dataType: "json"
         ).success (data) ->
           preview.html data.body
+          preview.syntaxHighlight()
 
           renderReferencedUsers data.references.users