diff --git a/stackrc b/stackrc
index 1300f45..f7a0c87 100644
--- a/stackrc
+++ b/stackrc
@@ -665,6 +665,8 @@
         ;;
 esac
 
+# By default, devstack will use Ubuntu Cloud Archive.
+ENABLE_UBUNTU_CLOUD_ARCHIVE=$(trueorfalse True ENABLE_UBUNTU_CLOUD_ARCHIVE)
 
 # Images
 # ------