diff --git a/doom-modeline-segments.el b/doom-modeline-segments.el
index 21c0675..1089f91 100644
--- a/doom-modeline-segments.el
+++ b/doom-modeline-segments.el
@@ -289,6 +289,14 @@ mouse-1: Previous buffer\nmouse-3: Next buffer"
 (advice-add #'undo-tree-redo-1 :after #'doom-modeline-update-buffer-file-name)
 (advice-add #'symbol-overlay-rename :after #'doom-modeline-update-buffer-file-name)
 
+(with-no-warnings
+  (if (boundp 'after-focus-change-function)
+      (add-function :after after-focus-change-function
+                    (lambda ()
+                      (if (frame-focus-state)
+                          (doom-modeline-update-buffer-file-name))))
+    (add-hook 'focus-in-hook #'doom-modeline-update-buffer-file-name)))
+
 (when (>= emacs-major-version 26)
   (add-variable-watcher
    'doom-modeline-buffer-file-name-style