diff --git a/src/Illuminate/Contracts/Foundation/Application.php b/src/Illuminate/Contracts/Foundation/Application.php
index d888c8cc0cca..84ce820fc1a5 100644
--- a/src/Illuminate/Contracts/Foundation/Application.php
+++ b/src/Illuminate/Contracts/Foundation/Application.php
@@ -55,7 +55,7 @@ public function register($provider, $options = [], $force = false);
      * Register a deferred provider and service.
      *
      * @param  string  $provider
-     * @param  string  $service
+     * @param  string|null  $service
      * @return void
      */
     public function registerDeferredProvider($provider, $service = null);
diff --git a/src/Illuminate/Foundation/Application.php b/src/Illuminate/Foundation/Application.php
index 9ba7e5db28fa..3abaa1711b02 100755
--- a/src/Illuminate/Foundation/Application.php
+++ b/src/Illuminate/Foundation/Application.php
@@ -668,7 +668,7 @@ public function loadDeferredProvider($service)
      * Register a deferred provider and service.
      *
      * @param  string  $provider
-     * @param  string  $service
+     * @param  string|null  $service
      * @return void
      */
     public function registerDeferredProvider($provider, $service = null)