diff --git a/lib/middleware/csrf.js b/lib/middleware/csrf.js
index 1c3854b45..b663be0e8 100644
--- a/lib/middleware/csrf.js
+++ b/lib/middleware/csrf.js
@@ -63,15 +63,6 @@ module.exports = function csrf(options) {
         return token || (token = saltedToken(secret));
       };
       
-      // compatibility with old middleware
-      Object.defineProperty(req.session, '_csrf', {
-        configurable: true,
-        get: function() {
-          console.warn('req.session._csrf is deprecated, use req.csrfToken() instead');
-          return req.csrfToken();
-        }
-      });
-      
       // ignore these methods
       if ('GET' == req.method || 'HEAD' == req.method || 'OPTIONS' == req.method) return next();