diff --git a/lib/get-config.js b/lib/get-config.js
index 1937c546db..24560876f0 100644
--- a/lib/get-config.js
+++ b/lib/get-config.js
@@ -34,9 +34,9 @@ module.exports = async (opts, logger) => {
 
         // For each plugin defined in a shareable config, save in `pluginsPath` the extendable config path,
         // so those plugin will be loaded relatively to the config file
-        Object.keys(extendsOpts).reduce((pluginsPath, option) => {
+        Object.entries(extendsOpts).reduce((pluginsPath, [option, value]) => {
           if (PLUGINS_DEFINITIONS[option]) {
-            castArray(extendsOpts[option])
+            castArray(value)
               .filter(plugin => isString(plugin) || (isPlainObject(plugin) && isString(plugin.path)))
               .map(plugin => (isString(plugin) ? plugin : plugin.path))
               .forEach(plugin => {