diff --git a/lisp/progmodes/rust-ts-mode.el b/lisp/progmodes/rust-ts-mode.el
index a07634199ff..18951a10c55 100644
--- a/lisp/progmodes/rust-ts-mode.el
+++ b/lisp/progmodes/rust-ts-mode.el
@@ -290,13 +290,13 @@
 (defun rust-ts-mode--comment-docstring (node override start end &rest _args)
   "Use the comment or documentation face appropriately for comments."
   (let* ((beg (treesit-node-start node))
-         (end (treesit-node-end node))
          (face (save-excursion
                  (goto-char beg)
-                 (if (looking-at "///")
+                 (if (looking-at "//\\(?:/\\|!\\)")
                      'font-lock-doc-face
                    'font-lock-comment-face))))
-    (treesit-fontify-with-override beg end face override start end)))
+    (treesit-fontify-with-override beg (treesit-node-end node)
+                                   face override start end)))
 
 (defun rust-ts-mode--fontify-scope (node override start end &optional tail-p)
   (let* ((case-fold-search nil)