diff --git a/.config/guix/system/default.scm b/.config/guix/system/default.scm
index 1e5c4dee..3c5964ed 100644
--- a/.config/guix/system/default.scm
+++ b/.config/guix/system/default.scm
@@ -66,22 +66,24 @@ StrictNodes 1")
   ;; with Wicd, and more.
   (modify-services
       %desktop-services
-    ;; (guix-service-type config =>
-    ;;                    (guix-configuration
-    ;;                     (inherit config)
-    ;;                     ;; Don't clean build deps.
-    ;;                     ;; See (info "(guix) Invoking guix-daemon").
-    ;;                     ;; WARNING: This tends to yield an ever-growing store.
-    ;;                     ;; (extra-options '("--gc-keep-outputs"))
-    ;;                     ;; Specify substitutes manually.  Defaults
-    ;;                     ;; should be good enough in most cases.
-    ;;                     (substitute-urls
-    ;;                      (list
-    ;;                       "https://qualif.ci.guix.gnu.org"
-    ;;                       ;; "https://berlin.guixsd.org"
-    ;;                       ;; "https://mirror.hydra.gnu.org"
-    ;;                       ;; "https://hydra.gnu.org"
-    ;;                       ))))
+    (guix-service-type config =>
+                       (guix-configuration
+                        (inherit config)
+                        ;; Don't clean build deps.
+                        ;; See (info "(guix) Invoking guix-daemon").
+                        ;; WARNING: This tends to yield an ever-growing store.
+                        ;; (extra-options '("--gc-keep-outputs"))
+                        ;; Specify substitutes manually.  Defaults
+                        ;; should be good enough in most cases.
+                        (substitute-urls
+                         (list
+                          "https://ci.guix.gnu.org"
+                          "https://gx.bufio.org"
+                          ;; "https://qualif.ci.guix.gnu.org"
+                          ;; "https://berlin.guixsd.org"
+                          ;; "https://mirror.hydra.gnu.org"
+                          ;; "https://hydra.gnu.org"
+                          ))))
     (udev-service-type config =>
                        (udev-configuration
                         (inherit config)