diff --git a/apps/cic-eth/docker/Dockerfile b/apps/cic-eth/docker/Dockerfile
index 0fc20c79..5f7447f2 100644
--- a/apps/cic-eth/docker/Dockerfile
+++ b/apps/cic-eth/docker/Dockerfile
@@ -8,7 +8,7 @@ RUN apt-get update && \
 #RUN python -m venv venv && . venv/bin/activate
 
 ARG pip_extra_index_url_flag='--index https://pypi.org/simple --extra-index-url https://pip.grassrootseconomics.net:8433'
-ARG ="https://pip.grassrootseconomics.net:8433"
+ARG EXTRA_INDEX_URL="https://pip.grassrootseconomics.net:8433"
 ARG GITLAB_PYTHON_REGISTRY="https://gitlab.com/api/v4/projects/27624814/packages/pypi/simple"
 RUN /usr/local/bin/python -m pip install --upgrade pip
 RUN pip install semver