diff --git a/defaultConfig.js b/defaultConfig.js
index b9edea103..c4f4eb387 100644
--- a/defaultConfig.js
+++ b/defaultConfig.js
@@ -720,13 +720,13 @@ module.exports = {
   */
 
   zIndex: {
+    'auto': 'auto',
     '0': 0,
     '10': 10,
     '20': 20,
     '30': 30,
     '40': 40,
     '50': 50,
-    'auto': 'auto',
   },