diff --git a/src/Illuminate/Contracts/Auth/Guard.php b/src/Illuminate/Contracts/Auth/Guard.php
index 2a2ed3d9a5e4..4af0eb9bb7e9 100644
--- a/src/Illuminate/Contracts/Auth/Guard.php
+++ b/src/Illuminate/Contracts/Auth/Guard.php
@@ -4,6 +4,13 @@
 
 interface Guard
 {
+    /**
+     * Determine if the current user is authenticated.
+     *
+     * @return \Illuminate\Contracts\Auth\Authenticatable
+     */
+    public function authenticate();
+
     /**
      * Determine if the current user is authenticated.
      *