diff --git a/comanage-registry-mailman/core/Dockerfile b/comanage-registry-mailman/core/Dockerfile
index 784a2da..d8a995a 100644
--- a/comanage-registry-mailman/core/Dockerfile
+++ b/comanage-registry-mailman/core/Dockerfile
@@ -57,6 +57,7 @@ ENV MAILMAN_CONFIG_FILE /etc/mailman.cfg
 # are accepted upstream.
 COPY addresses.py /usr/local/lib/python3.6/site-packages/mailman/rest/addresses.py
 COPY users.py /usr/local/lib/python3.6/site-packages/mailman/rest/users.py
+RUN chmod 644 /usr/local/lib/python3.6/site-packages/mailman/rest/addresses.py /usr/local/lib/python3.6/site-packages/mailman/rest/users.py
 
 ENTRYPOINT ["docker-entrypoint.sh"]
 CMD ["master", "--force"]