diff --git a/lib/pretty_text.rb b/lib/pretty_text.rb
index 3e0d563cf26..e116f37f929 100644
--- a/lib/pretty_text.rb
+++ b/lib/pretty_text.rb
@@ -67,6 +67,7 @@ module PrettyText
     decorate_context(ctx)
 
     ctx_load(ctx,
+      "public/javascripts/highlight.pack.js",
       "vendor/assets/javascripts/better_markdown.js",
       "app/assets/javascripts/defer/html-sanitizer-bundle.js",
       "app/assets/javascripts/discourse/dialects/dialect.js",