diff --git a/lisp/progmodes/lua-ts-mode.el b/lisp/progmodes/lua-ts-mode.el
index 05a3ff6d7c6..dc2a8fcec1e 100644
--- a/lisp/progmodes/lua-ts-mode.el
+++ b/lisp/progmodes/lua-ts-mode.el
@@ -774,7 +774,7 @@ lua-ts-mode
                                       "vararg_expression"))))
                    (text "comment"))))
 
-    ;; Imenu.
+    ;; Imenu/Outline.
     (setq-local treesit-simple-imenu-settings
                 `(("Requires"
                    "\\`function_call\\'"
@@ -789,15 +789,5 @@ lua-ts-mode
     ;; Which-function.
     (setq-local which-func-functions (treesit-defun-at-point))
 
-    ;; Outline.
-    (setq-local outline-regexp
-                (rx (seq (0+ space)
-                         (or (seq "--[[" (0+ space) eol)
-                             (seq symbol-start
-                                  (or "do" "for" "if" "repeat" "while"
-                                      (seq (? (seq "local" (1+ space)))
-                                           "function"))
-                                  symbol-end)))))
-
     ;; Align.
     (setq-local align-indent-before-aligning t)