diff --git a/lisp/progmodes/elixir-ts-mode.el b/lisp/progmodes/elixir-ts-mode.el
index a3e11658468..cacdb266298 100644
--- a/lisp/progmodes/elixir-ts-mode.el
+++ b/lisp/progmodes/elixir-ts-mode.el
@@ -734,9 +734,6 @@ Return nil if NODE is not a defun node or doesn't have a name."
     (when (treesit-ready-p 'heex)
       (setq-local treesit-range-settings elixir-ts--treesit-range-rules)
 
-      (setq-local treesit-simple-indent-rules
-                  (append treesit-simple-indent-rules heex-ts--indent-rules))
-
       (setq-local treesit-font-lock-settings
                   (append treesit-font-lock-settings
                           heex-ts--font-lock-settings))