diff --git a/init.el b/init.el
index 46ff4bd..a060886 100644
--- a/init.el
+++ b/init.el
@@ -19,17 +19,21 @@
       use-package-expand-minimally t)
 (require 'use-package)
 
-(let ((emacs-tmp-dir (expand-file-name (format "emacs%d" (user-uid))
-                                       temporary-file-directory)))
-  (setq auto-save-file-name-transforms `((".*" ,emacs-tmp-dir t))
-        auto-save-list-file-prefix emacs-tmp-dir
-        backup-directory-alist (setq undo-tree-history-directory-alist
-                                     `((".*" . ,emacs-tmp-dir)))
-        org-preview-latex-image-directory (expand-file-name "ltximg" emacs-tmp-dir)))
+(require 'xdg)
+(defvar my-tmp-dir (if-let* ((runtime-dir (xdg-runtime-dir)))
+                       (expand-file-name "emacs/"
+                                         runtime-dir)
+                     (expand-file-name (format "emacs%d/"
+                                               (user-uid))
+                                       temporary-file-directory))
+  "Directory used to store temporary state.")
 
-(setq backup-by-copying t
+(setq auto-save-file-name-transforms `((".*" ,my-tmp-dir t))
+      auto-save-list-file-prefix my-tmp-dir
+      backup-directory-alist `((".*" . ,my-tmp-dir))
+      backup-by-copying t
       inhibit-splash-screen t
-      custom-file (expand-file-name "custom.el" temporary-file-directory)
+      custom-file (expand-file-name "custom.el" my-tmp-dir)
       custom-safe-themes t)
 
 (defun my-inhibit-hl-line-mode ()
@@ -539,6 +543,9 @@
   ;; NixOS minimal LaTeX setup
   (org-latex-compiler "lualatex")
   (org-preview-latex-default-process 'lua-dvisvgm)
+  (org-preview-latex-image-directory (if-let* ((cache (xdg-cache-home)))
+                                         (expand-file-name "ltximg/" cache)
+                                       ".ltximg/"))
   (org-latex-src-block-backend 'engraved)
   :config
   (setq org-format-latex-options (plist-put org-format-latex-options :scale 1.3)