diff --git a/config/rebuildd.default b/config/rebuildd.default
index c02efe3..8979d40 100644
--- a/config/rebuildd.default
+++ b/config/rebuildd.default
@@ -2,7 +2,7 @@ START_REBUILDD=1
 START_REBUILDD_HTTPD=1
 PBUILDER_BIN=/usr/sbin/pbuilder
 PBUILDER_CACHE_PATH="/var/cache/pbuilder"
-PBUILDER_MIRROR=http://ftp.debian.org/debian
+PBUILDER_MIRROR=https://ftp.debian.org/debian
 ARCHS="amd64 i386 armhf"
 DISTS="wheezy jessie stretch"
 ENABLE_BUILDER_MAINT=1