diff --git a/core/core-ui.el b/core/core-ui.el
index bb596db38..54fe47f9d 100644
--- a/core/core-ui.el
+++ b/core/core-ui.el
@@ -110,11 +110,9 @@ shorter major mode name in the mode-line. See `doom|set-mode-name'.")
 (def-package! highlight-escape-sequences
   :hook ((prog-mode conf-mode) . highlight-escape-sequences-mode))
 
-;; `rainbow-delimiters' Helps us distinguish stacked delimiter pairs. Especially
-;; in parentheses-drunk languages like Lisp.
-(def-package! rainbow-delimiters
-  :hook (lisp-mode . rainbow-delimiters-mode)
-  :config (setq rainbow-delimiters-max-face-count 3))
+;; `rainbow-delimiters' --- helps us distinguish stacked delimiter pairs.
+;; Especially in parentheses-drunk languages like Lisp.
+(setq rainbow-delimiters-max-face-count 3)
 
 ;; `restart-emacs'
 (setq restart-emacs--args (list "--restore"))
diff --git a/modules/lang/common-lisp/config.el b/modules/lang/common-lisp/config.el
index eac1e33c2..0db5ccc10 100644
--- a/modules/lang/common-lisp/config.el
+++ b/modules/lang/common-lisp/config.el
@@ -9,6 +9,8 @@
     :definition #'sly-edit-definition
     :documentation #'sly-describe-symbol)
 
+  (add-hook 'lisp-mode-hook #'rainbow-delimiters-mode)
+
   (defun +common-lisp|cleanup-sly-maybe ()
     "Kill processes and leftover buffers when killing the last sly buffer."
     (unless (cl-loop for buf in (delq (current-buffer) (buffer-list))