diff --git a/docker/Dockerfile.postgres b/docker/Dockerfile.postgres
index 720bdff8..3b25b802 100644
--- a/docker/Dockerfile.postgres
+++ b/docker/Dockerfile.postgres
@@ -1,6 +1,9 @@
 FROM postgres:10
 
 ENV POSTGRES_USER postgres
+# Do not require a PostgreSQL superuser password.
+# See https://github.com/docker-library/postgres/issues/681.
+ENV POSTGRES_HOST_AUTH_METHOD trust
 
 ADD ./config/sql /config/sql
 ADD ./docker/entrypoint.postgres.sh /entrypoint.sh