diff --git a/Dockerfile b/Dockerfile
index 5db02e9..93b1d6b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,12 +13,12 @@ RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-k
  && echo 'deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main' > /etc/apt/sources.list.d/pgdg.list \
  && apt-get update \
  && apt-get install -y postgresql-${PG_VERSION} postgresql-client-${PG_VERSION} postgresql-contrib-${PG_VERSION} \
- && rm -rf /var/lib/postgresql \
+ && rm -rf ${PG_HOME} \
  && rm -rf /var/lib/apt/lists/*
 
 COPY start /start
 RUN chmod 755 /start
 
 EXPOSE 5432/tcp
-VOLUME ["/var/lib/postgresql", "/run/postgresql"]
+VOLUME ["${PG_HOME}", "/run/postgresql"]
 CMD ["/start"]