diff --git a/Dockerfile b/Dockerfile
index f254df0eda423547f2378ce56a0d71834ce62034..fa3d7df81207b12952ce4320d8214c53e11ebba5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -71,5 +71,6 @@ RUN set -ex; \
 COPY entrypoint.sh entrypoint.sh
 ADD mod_auth_mellon.conf /etc/apache2/conf-enabled/mod_auth_mellon.conf
 
+EXPOSE 443
 ENTRYPOINT ["/var/www/html/entrypoint.sh"]
 CMD ["apache2-foreground"]