diff --git a/gnu/packages/mail.scm b/gnu/packages/mail.scm
index d100e99cfb..600c921d48 100644
--- a/gnu/packages/mail.scm
+++ b/gnu/packages/mail.scm
@@ -781,7 +781,7 @@ (define-public mu
               (string-append (assoc-ref outputs "out")
                              "/share/emacs/site-lisp"))
              #t)))))
-    (home-page "http://www.djcbsoftware.nl/code/mu/")
+    (home-page "https://www.djcbsoftware.nl/code/mu/")
     (synopsis "Quickly find emails")
     (description
      "Mu is a tool for dealing with e-mail messages stored in the