diff --git a/gnu/packages/guile.scm b/gnu/packages/guile.scm
index d79094e1ee..b654bbc96e 100644
--- a/gnu/packages/guile.scm
+++ b/gnu/packages/guile.scm
@@ -388,7 +388,7 @@ program can be installed in one go.")
     (version "0.2.1")
     (source (origin
               (method url-fetch)
-              (uri (string-append "ftp://alpha.gnu.org/gnu/artanis/artanis-"
+              (uri (string-append "mirror://gnu/artanis/artanis-"
                                   version ".tar.gz"))
               (sha256
                (base32