diff --git a/lib/config.js b/lib/config.js
index 550f6b1..0ade58a 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -58,7 +58,6 @@ function getEnv (prefix, name) {
 
   return process.env[envVar.toUpperCase().replace(/-/g, '_')]
 }
-
 /**
  * Parse the server configuration settings from the environment.
  */
@@ -179,7 +178,7 @@ function loadConfig (prefix, localConfig) {
 
   const commonConfig = Immutable.fromJS({server, db, keys})
 
-  return commonConfig.merge(localConfig || {})
+  return commonConfig.mergeDeep(localConfig || {})
 }
 
 module.exports = {