diff --git a/etc/NEWS b/etc/NEWS
index bf19c34f021..95218faa1b6 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2804,6 +2804,9 @@ similar to prefix arguments, but are more flexible and discoverable.
 
 * Incompatible Editing Changes in Emacs 28.1
 
+** 'revert-buffer' will now preserve buffer-readedness.
+It previously switched the read-only flag off.
+
 ** 'electric-indent-mode' now also indents inside strings and comments,
 (unless the indentation function doesn't, of course).
 To recover the previous behavior you can use:
diff --git a/lisp/files.el b/lisp/files.el
index 0606ed64823..412562fc9a3 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -6317,7 +6317,9 @@ preserve markers and overlays, at the price of being slower."
   ;; interface, but leaving the programmatic interface the same.
   (interactive (list (not current-prefix-arg)))
   (let ((revert-buffer-in-progress-p t)
-        (revert-buffer-preserve-modes preserve-modes))
+        (revert-buffer-preserve-modes preserve-modes)
+        ;; Preserve buffer-readedness.
+        (buffer-read-only buffer-read-only))
     (funcall (or revert-buffer-function #'revert-buffer--default)
              ignore-auto noconfirm)))