diff --git a/diskimage_builder/elements/ubuntu/root.d/10-cache-ubuntu-tarball b/diskimage_builder/elements/ubuntu/root.d/10-cache-ubuntu-tarball
index 740dc7bc..0babcefb 100755
--- a/diskimage_builder/elements/ubuntu/root.d/10-cache-ubuntu-tarball
+++ b/diskimage_builder/elements/ubuntu/root.d/10-cache-ubuntu-tarball
@@ -13,7 +13,7 @@ set -o pipefail
 shopt -s extglob
 
 DIB_RELEASE=${DIB_RELEASE:-trusty}
-DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-http://cloud-images.ubuntu.com/$DIB_RELEASE/current}
+DIB_CLOUD_IMAGES=${DIB_CLOUD_IMAGES:-https://cloud-images.ubuntu.com/$DIB_RELEASE/current}
 if [ $DIB_RELEASE != "trusty" ] ; then
     BASE_IMAGE_FILE=${BASE_IMAGE_FILE:-$DIB_RELEASE-server-cloudimg-$ARCH.squashfs}
 else