diff --git a/contrib/guix/libexec/prelude.bash b/contrib/guix/libexec/prelude.bash
index b868cec8..16af13ad 100644
--- a/contrib/guix/libexec/prelude.bash
+++ b/contrib/guix/libexec/prelude.bash
@@ -50,7 +50,7 @@ fi
 # across time.
 time-machine() {
     # shellcheck disable=SC2086
-    guix time-machine --url=https://github.com/monero-project/guix.git \
+    guix time-machine --url=https://codeberg.org/guix/guix.git \
                       --commit=639f79952e51a58b7fbca2a826dcc3df162300c1 \
                       --cores="$JOBS" \
                       --keep-failed \