diff --git a/pkgs/stdenv/linux/bootstrap-files/aarch64-unknown-linux-musl.nix b/pkgs/stdenv/linux/bootstrap-files/aarch64-unknown-linux-musl.nix
index 252783cce47cb..c1a96e66013c6 100644
--- a/pkgs/stdenv/linux/bootstrap-files/aarch64-unknown-linux-musl.nix
+++ b/pkgs/stdenv/linux/bootstrap-files/aarch64-unknown-linux-musl.nix
@@ -1,11 +1,25 @@
+#
+# Files came from this Hydra build:
+#
+#   https://hydra.nixos.org/build/246470544
+#
+# …which used nixpkgs revision dd5621df6dcb90122b50da5ec31c411a0de3e538
+# to instantiate:
+#
+#   /nix/store/g480ass2vjmakaq03z7k2j95xnxh206a-stdenv-bootstrap-tools.drv
+#
+# …and then built:
+#
+#   /nix/store/95lm0y33dayag4542s8bi83s31bw68dr-stdenv-bootstrap-tools
+#
 {
   busybox = import <nix/fetchurl.nix> {
-    url = "https://wdtz.org/files/wjzsj9cmdkc70f78yh072483x8656nci-stdenv-bootstrap-tools-aarch64-unknown-linux-musl/on-server/busybox";
-    sha256 = "01s6bwq84wyrjh3rdsgxni9gkzp7ss8rghg0cmp8zd87l79y8y4g";
+    url = "http://tarballs.nixos.org/stdenv/aarch64-unknown-linux-musl/dd5621df6dcb90122b50da5ec31c411a0de3e538/busybox";
+    sha256 = "sha256-WuOaun7U5enbOy8SuuCo6G1fbGwsO16jhy/oM8K0lAs=";
     executable = true;
   };
   bootstrapTools = import <nix/fetchurl.nix> {
-    url = "https://wdtz.org/files/wjzsj9cmdkc70f78yh072483x8656nci-stdenv-bootstrap-tools-aarch64-unknown-linux-musl/on-server/bootstrap-tools.tar.xz";
-    sha256 = "0pbqrw9z4ifkijpfpx15l2dzi00rq8c5zg9ghimz5qgr5dx7f7cl";
+    url = "http://tarballs.nixos.org/stdenv/aarch64-unknown-linux-musl/dd5621df6dcb90122b50da5ec31c411a0de3e538/bootstrap-tools.tar.xz";
+    hash = "sha256-ZY9IMOmx1VOn6uoFDpdJbTnPX59TEkrVCzWNtjQ8/QE=";
   };
 }