diff --git a/doom-modeline.el b/doom-modeline.el
index 312b872..ffcbbc9 100644
--- a/doom-modeline.el
+++ b/doom-modeline.el
@@ -797,13 +797,15 @@ buffer where knowing the current project directory is important."
 (advice-add #'undo-tree-undo :after #'doom-modeline-update-buffer-file-state-icon)
 (advice-add #'undo-tree-redo :after #'doom-modeline-update-buffer-file-state-icon)
 (advice-add #'narrow-to-region :after #'doom-modeline-update-buffer-file-state-icon)
-(advice-add #'widen :after #'doom-modeline-update-buffer-file-state-icon)
+(advice-add
+ #'widen :after #'doom-modeline-update-buffer-file-state-icon)
 
-(add-variable-watcher
- 'buffer-read-only
- (lambda (_sym val op _where)
-   (when (and (eq op 'set) (eq val nil))
-     (doom-modeline-update-buffer-file-state-icon))))
+(when (>= emacs-major-version 26)
+  (add-variable-watcher
+   'buffer-read-only
+   (lambda (_sym _val op _where)
+     (when (eq op 'set)
+       (doom-modeline-update-buffer-file-state-icon)))))
 
 (defvar-local doom-modeline--buffer-file-name nil)
 (defun doom-modeline-update-buffer-file-name (&rest _)