diff --git a/src/Guard.php b/src/Guard.php
index 60a7658a..993aeedb 100644
--- a/src/Guard.php
+++ b/src/Guard.php
@@ -14,6 +14,13 @@ class Guard
      */
     protected $auth;
 
+    /**
+     * The provider name.
+     *
+     * @var string
+     */
+    protected $provider;
+
     /**
      * The number of minutes tokens should be allowed to remain valid.
      *
@@ -26,12 +33,14 @@ class Guard
      *
      * @param  \Illuminate\Contracts\Auth\Factory  $auth
      * @param  int  $expiration
+     * @param  string $provider
      * @return void
      */
-    public function __construct(AuthFactory $auth, $expiration = null)
+    public function __construct(AuthFactory $auth, $expiration = null, $provider = null)
     {
         $this->auth = $auth;
         $this->expiration = $expiration;
+        $this->provider = $provider;
     }
 
     /**
@@ -55,7 +64,8 @@ public function __invoke(Request $request)
 
             if (! $accessToken ||
                 ($this->expiration &&
-                 $accessToken->created_at->lte(now()->subMinutes($this->expiration)))) {
+                 $accessToken->created_at->lte(now()->subMinutes($this->expiration))) ||
+                ! $this->hasValidProvider($accessToken->tokenable)) {
                 return;
             }
 
@@ -77,4 +87,22 @@ protected function supportsTokens($tokenable = null)
             get_class($tokenable)
         ));
     }
+
+    /**
+     * Determine if the Token Provider Correct.
+     *
+     * @param  \Illuminate\Database\Eloquent\Model $tokenable
+     * @return bool
+     */
+    protected function hasValidProvider($tokenable)
+    {
+        // If provider is null this method will return TRUE
+        if ($this->provider === null) {
+            return true;
+        }
+
+        $model = config("auth.providers.{$this->provider}.model");
+
+        return $tokenable instanceof $model;
+    }
 }
diff --git a/src/SanctumServiceProvider.php b/src/SanctumServiceProvider.php
index ecee3fc6..706ebda0 100644
--- a/src/SanctumServiceProvider.php
+++ b/src/SanctumServiceProvider.php
@@ -2,6 +2,7 @@
 
 namespace Laravel\Sanctum;
 
+use Illuminate\Auth\RequestGuard;
 use Illuminate\Contracts\Http\Kernel;
 use Illuminate\Support\Facades\Auth;
 use Illuminate\Support\Facades\Route;
@@ -21,6 +22,7 @@ public function register()
         config([
             'auth.guards.sanctum' => array_merge([
                 'driver' => 'sanctum',
+                'provider' => null,
             ], config('auth.guards.sanctum', [])),
         ]);
 
@@ -92,10 +94,29 @@ protected function defineRoutes()
     protected function configureGuard()
     {
         Auth::resolved(function ($auth) {
-            $auth->viaRequest('sanctum', new Guard($auth, config('sanctum.expiration')));
+            $auth->extend('sanctum', function ($app, $name, array $config) use ($auth) {
+                return tap($this->registerGuard($auth, $config), function ($guard) {
+                    $this->app->refresh('request', $guard, 'setRequest');
+                });
+            });
         });
     }
 
+    /**
+     * Register the guard.
+     *
+     * @param \Illuminate\Contracts\Auth\Factory $auth
+     * @param array $config
+     * @return RequestGuard
+     */
+    protected function registerGuard($auth, $config)
+    {
+        return new RequestGuard(
+                new Guard($auth, config('sanctum.expiration'), $config['provider']),
+                $this->app['request'],
+                $auth->createUserProvider());
+    }
+
     /**
      * Configure the Sanctum middleware and priority.
      *
diff --git a/tests/GuardTest.php b/tests/GuardTest.php
index bef095ed..2d8ec85d 100644
--- a/tests/GuardTest.php
+++ b/tests/GuardTest.php
@@ -39,7 +39,7 @@ public function test_authentication_is_attempted_with_web_middleware()
     {
         $factory = Mockery::mock(AuthFactory::class);
 
-        $guard = new Guard($factory);
+        $guard = new Guard($factory, null, 'users');
 
         $webGuard = Mockery::mock(stdClass::class);
 
@@ -61,7 +61,7 @@ public function test_authentication_is_attempted_with_token_if_no_session_presen
 
         $factory = Mockery::mock(AuthFactory::class);
 
-        $guard = new Guard($factory);
+        $guard = new Guard($factory, null, 'users');
 
         $webGuard = Mockery::mock(stdClass::class);
 
@@ -86,7 +86,7 @@ public function test_authentication_with_token_fails_if_expired()
 
         $factory = Mockery::mock(AuthFactory::class);
 
-        $guard = new Guard($factory, 1);
+        $guard = new Guard($factory, 1, 'users');
 
         $webGuard = Mockery::mock(stdClass::class);
 
@@ -126,7 +126,7 @@ public function test_authentication_is_successful_with_token_if_no_session_prese
 
         $factory = Mockery::mock(AuthFactory::class);
 
-        $guard = new Guard($factory);
+        $guard = new Guard($factory, null);
 
         $webGuard = Mockery::mock(stdClass::class);