diff --git a/scale_build/bootstrap/bootstrapdir.py b/scale_build/bootstrap/bootstrapdir.py
index 5b10ca8c..e83cdb04 100644
--- a/scale_build/bootstrap/bootstrapdir.py
+++ b/scale_build/bootstrap/bootstrapdir.py
@@ -30,11 +30,12 @@ def setup(self):
 
     def debootstrap_debian(self):
         manifest = get_manifest()
+        apt_base_url = get_apt_base_url()
         run(
             ['debootstrap'] + self.deopts + [
                 '--keyring', '/etc/apt/trusted.gpg.d/debian-archive-truenas-automatic.gpg',
                 manifest['debian_release'],
-                self.chroot_basedir, manifest['apt-repos']['url']
+                self.chroot_basedir, apt_base_url + manifest['apt-repos']['url']
             ]
         )