diff --git a/README.md b/README.md
index babca83..3b6acdc 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,8 @@ To run with postgresql from another docker container:
         --env PG_ENV_OSM_DB=<database> \
         --env PG_ENV_OSM_PASSWORD=<password> vitalif/renderd-osm
 
+Also you may override host and port with PG_ENV_OSM_HOST and PG_ENV_OSM_PORT.
+
 Once the container is up you should be able to see a small map of the
 world once you point your browser to [http://127.0.0.1:8096/osm/0/0/0.png](http://127.0.0.1:8096/osm/0/0/0.png)
 
diff --git a/renderd/run b/renderd/run
index 7bb1084..be13348 100644
--- a/renderd/run
+++ b/renderd/run
@@ -12,8 +12,8 @@ sed -i -e "s/{{OSM_BRIGHT_XML_DIR}}/\/usr\/share\/mapnik\/osm-bright-$OSM_BRIGHT
 # osm-carto setup
 cd /usr/share/mapnik/openstreetmap-carto-$OSM_CARTO_VERSION/
 cp project.mml.orig project.mml
-sed -i "s/\"dbname\": \"gis\"/\"host\": \"$PG_PORT_5432_TCP_ADDR\",\n \
-\"port\": \"$PG_PORT_5432_TCP_PORT\",\n \
+sed -i "s/\"dbname\": \"gis\"/\"host\": \"$PG_ENV_OSM_HOST\",\n \
+\"port\": \"$PG_ENV_OSM_PORT\",\n \
 \"user\": \"$PG_ENV_OSM_USER\",\n \
 \"password\": \"$PG_ENV_OSM_PASSWORD\",\n \
 \"dbname\":\"$PG_ENV_OSM_DB\"/" project.mml
@@ -24,8 +24,8 @@ cd /usr/share/mapnik/osm-bright-$OSM_BRIGHT_VERSION/
 cp configure.py.sample configure.py
 # prepare configure.py
 sed -i -e "s|^config\[\"path\"\].*|config\[\"path\"\] = \"$(pwd)\"|" \
-       -e "s/^config\[\"postgis\"\]\[\"host\"\].*/config\[\"postgis\"\]\[\"host\"\] = \"$PG_PORT_5432_TCP_ADDR\"/" \
-       -e "s/^config\[\"postgis\"\]\[\"port\"\].*/config\[\"postgis\"\]\[\"port\"\] = \"$PG_PORT_5432_TCP_PORT\"/" \
+       -e "s/^config\[\"postgis\"\]\[\"host\"\].*/config\[\"postgis\"\]\[\"host\"\] = \"$PG_ENV_OSM_HOST\"/" \
+       -e "s/^config\[\"postgis\"\]\[\"port\"\].*/config\[\"postgis\"\]\[\"port\"\] = \"$PG_ENV_OSM_PORT\"/" \
        -e "s/^config\[\"postgis\"\]\[\"dbname\"\].*/config\[\"postgis\"\]\[\"dbname\"\] = \"$PG_ENV_OSM_DB\"/" \
        -e "s/^config\[\"postgis\"\]\[\"password\"\].*/config\[\"postgis\"\]\[\"password\"\] = \"$PG_ENV_OSM_PASSWORD\"/" \
        -e "s/^config\[\"postgis\"\]\[\"user\"\].*/config\[\"postgis\"\]\[\"user\"\] = \"$PG_ENV_OSM_USER\"/" configure.py