diff --git a/lib/cartodb/server_options.js b/lib/cartodb/server_options.js
index 9410b2f4..dff1280e 100644
--- a/lib/cartodb/server_options.js
+++ b/lib/cartodb/server_options.js
@@ -127,7 +127,7 @@ module.exports = {
             // TODO: allow to specify in configuration
             srid: 3857
         },
-        datasource: rendererConfig.mapnik.postgis,
+        datasource: rendererConfig.mapnik.postgis || global.environment.postgres || {},
         cachedir: global.environment.millstone.cache_basedir,
         use_workers: rendererConfig.mapnik.useCartocssWorkers || false,
         mapnik_version: global.environment.mapnik_version,