diff --git a/lib/index.js b/lib/index.js
index 4327433..775ba3d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -34,7 +34,7 @@ let query = (text, values_in) => {
 };
 
 function configure(overrides) {
-  pool = new Pool({...config, ...overrides})
+  pool = new Pool(Object.assign(config, overrides))
 }
 
 module.exports.query = query;