diff --git a/CHANGES.md b/CHANGES.md
index d7a1d1ff..ca732df0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -28,6 +28,7 @@
     - Show mode toggle message only if it is called interactively
     - Copy `markdown-css-paths` in the output buffer [GH-834][]
     - Change temporary buffer name according to the Emacs naming convention [GH-848][]
+    - Mark `markdown-css-paths` safe as file local variables [GH-834][]
 
   [gh-780]: https://github.com/jrblevin/markdown-mode/issues/780
   [gh-802]: https://github.com/jrblevin/markdown-mode/issues/802
diff --git a/markdown-mode.el b/markdown-mode.el
index 89d89629..2152cd60 100644
--- a/markdown-mode.el
+++ b/markdown-mode.el
@@ -370,6 +370,7 @@ Math support can be enabled, disabled, or toggled later using
 (defcustom markdown-css-paths nil
   "List of URLs of CSS files to link to in the output XHTML."
   :group 'markdown
+  :safe (apply-partially #'seq-every-p #'stringp)
   :type '(repeat (string :tag "CSS File Path")))
 
 (defcustom markdown-content-type "text/html"