diff --git a/modules/lang/lua/config.el b/modules/lang/lua/config.el
index b87b6ad4d..f93a10611 100644
--- a/modules/lang/lua/config.el
+++ b/modules/lang/lua/config.el
@@ -64,6 +64,7 @@ lua-language-server.")
 (use-package! fennel-mode
   :when (modulep! +fennel)
   :mode "\\.fenneldoc\\'"
+  :hook (fennel-mode . rainbow-delimiters-mode)
   :config
   (set-lookup-handlers! 'fennel-mode
     :definition #'fennel-find-definition