diff --git a/config b/config
index be4aa75..8d89043 100644
--- a/config
+++ b/config
@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
 export POSTGRES_IMAGE=${POSTGRES_IMAGE:="postgres"}
 export POSTGRES_IMAGE_VERSION=${POSTGRES_IMAGE_VERSION:="9.4.4"}
-export POSTGRES_ROOT=/var/lib/dokku/services/postgres
+export POSTGRES_ROOT=${POSTGRES_ROOT:="/var/lib/dokku/services/postgres"}
 
 export PLUGIN_COMMAND_PREFIX="postgres"
-export PLUGIN_DATA_ROOT=${PLUGIN_DATA_ROOT:="$POSTGRES_ROOT"}
+export PLUGIN_DATA_ROOT=$POSTGRES_ROOT
 export PLUGIN_DATASTORE_PORTS=(5432)
 export PLUGIN_DEFAULT_ALIAS="DATABASE"
 export PLUGIN_IMAGE=$POSTGRES_IMAGE