diff --git a/configuration/mutt.md b/configuration/mutt.md
index 879e9753..eae19b32 100644
--- a/configuration/mutt.md
+++ b/configuration/mutt.md
@@ -56,7 +56,7 @@ set pgp_clearsign_command="qubes-gpg-client-wrapper --batch --armor --textmode -
 # I found no option to add Charset armor header when it is UTF-8, since this is
 # default (as specified in RFC4880). This is needed to workaround bug in
 # Enigmail, which ignores RFC and without this header Thunderbird interprets
-# plaintext as us-ascii. See http://sourceforge.net/p/enigmail/bugs/38/.
+# plaintext as us-ascii. See https://sourceforge.net/p/enigmail/bugs/38/.
 
 ### also note you must specify absolute path of pgpewrap when using debian
 ### e.g. /usr/lib/mutt/pgpewrap