diff --git a/base-notebook/Dockerfile b/base-notebook/Dockerfile
index 020cd41a..9e1edcfa 100644
--- a/base-notebook/Dockerfile
+++ b/base-notebook/Dockerfile
@@ -3,7 +3,8 @@
 
 # Ubuntu 18.04 (bionic)
 # https://hub.docker.com/_/ubuntu/?tab=tags&name=bionic
-ARG BASE_CONTAINER=ubuntu:bionic-20200112@sha256:bc025862c3e8ec4a8754ea4756e33da6c41cba38330d7e324abd25c8e0b93300
+ARG ROOT_CONTAINER=ubuntu:bionic-20200112@sha256:bc025862c3e8ec4a8754ea4756e33da6c41cba38330d7e324abd25c8e0b93300
+ARG BASE_CONTAINER=$ROOT_CONTAINER
 FROM $BASE_CONTAINER
 
 LABEL maintainer="Jupyter Project <jupyter@googlegroups.com>"