diff --git a/markdown-mode.el b/markdown-mode.el
index b623c137..39c33976 100644
--- a/markdown-mode.el
+++ b/markdown-mode.el
@@ -53,6 +53,8 @@
 (declare-function sh-set-shell "sh-script")
 
 (when (version< "29" emacs-version)
+  (declare-function mailcap-mime-type-to-extension "mailcap")
+  (declare-function file-name-with-extension "files")
   (declare-function yank-media-handler "yank-media"))