diff --git a/index.js b/index.js
index c3f814b..dfeead2 100644
--- a/index.js
+++ b/index.js
@@ -39,7 +39,7 @@ module.exports = function postcssrc (ctx, path, options) {
 
   path = path ? resolve(path) : process.cwd()
 
-  options = assign({}, options)
+  options = assign({rcExtensions: true}, options)
 
   if (!ctx.env) process.env.NODE_ENV = 'development'