diff --git a/guix/download.scm b/guix/download.scm
index 73c0e897b4..b2dcdc88f9 100644
--- a/guix/download.scm
+++ b/guix/download.scm
@@ -236,8 +236,15 @@ (define %content-addressed-mirrors
   ;; List of content-addressed mirrors.  Each mirror is represented as a
   ;; procedure that takes a file name, an algorithm (symbol) and a hash
   ;; (bytevector), and returns a URL or #f.
+  ;; Note: Avoid 'https' to mitigate <http://bugs.gnu.org/22774>.
   ;; TODO: Add more.
   '(list (lambda (file algo hash)
+           ;; Files served by 'guix publish' are accessible under a single
+           ;; hash algorithm.
+           (string-append "http://mirror.hydra.gnu.org/file/"
+                          file "/" (symbol->string algo) "/"
+                          (bytevector->nix-base32-string hash)))
+         (lambda (file algo hash)
            ;; 'tarballs.nixos.org' supports several algorithms.
            (string-append "http://tarballs.nixos.org/"
                           (symbol->string algo) "/"