diff --git a/Dockerfile b/Dockerfile
index bf9b26be..2d78b0fc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,7 @@
 FROM python:3.7.3-alpine3.9 AS builder
 
 ARG CSP
+ARG CDN_URL=/static/assets/
 ENV TZ UTC
 
 RUN mkdir -p /install/.venv