diff --git a/.config/emacs/init.el b/.config/emacs/init.el
index d99228f..28bd7f7 100644
--- a/.config/emacs/init.el
+++ b/.config/emacs/init.el
@@ -1,5 +1,11 @@
 (load-file ".config/emacs/init-elpaca.el")
 
+(defun git-tracked-file-p (filename)
+  "Check whether the file FILENAME is tracked by git."
+  (let ((dirname (file-name-parent-directory filename)))
+    (zerop (call-process "git" nil nil nil
+                         "-C" dirname "ls-files" "--error-unmatch" filename))))
+
 (use-package emacs
   :ensure nil
   :bind (("C-z" . nil)
@@ -20,6 +26,8 @@
   :custom
   ; keep-sorted start
   (auto-save-interval 20)
+  (auto-save-visited-mode t)
+  (auto-save-visited-predicate (lambda () (git-tracked-file-p buffer-file-name)))
   (column-number-mode t)
   (dired-dwim-target 'dired-dwim-target-next)
   (display-time-24hr-format t)