diff --git a/src/Illuminate/Auth/DatabaseUserProvider.php b/src/Illuminate/Auth/DatabaseUserProvider.php
index 8aa563d82023..111e5522563a 100755
--- a/src/Illuminate/Auth/DatabaseUserProvider.php
+++ b/src/Illuminate/Auth/DatabaseUserProvider.php
@@ -2,6 +2,7 @@
 
 namespace Illuminate\Auth;
 
+use Closure;
 use Illuminate\Contracts\Auth\Authenticatable as UserContract;
 use Illuminate\Contracts\Auth\UserProvider;
 use Illuminate\Contracts\Hashing\Hasher as HasherContract;
@@ -117,6 +118,8 @@ public function retrieveByCredentials(array $credentials)
 
             if (is_array($value) || $value instanceof Arrayable) {
                 $query->whereIn($key, $value);
+            } elseif ($value instanceof Closure) {
+                $value($query);
             } else {
                 $query->where($key, $value);
             }
diff --git a/src/Illuminate/Auth/EloquentUserProvider.php b/src/Illuminate/Auth/EloquentUserProvider.php
index f175298ce07a..54dff6b87f2c 100755
--- a/src/Illuminate/Auth/EloquentUserProvider.php
+++ b/src/Illuminate/Auth/EloquentUserProvider.php
@@ -2,6 +2,7 @@
 
 namespace Illuminate\Auth;
 
+use Closure;
 use Illuminate\Contracts\Auth\Authenticatable as UserContract;
 use Illuminate\Contracts\Auth\UserProvider;
 use Illuminate\Contracts\Hashing\Hasher as HasherContract;
@@ -123,6 +124,8 @@ public function retrieveByCredentials(array $credentials)
 
             if (is_array($value) || $value instanceof Arrayable) {
                 $query->whereIn($key, $value);
+            } elseif ($value instanceof Closure) {
+                $value($query);
             } else {
                 $query->where($key, $value);
             }
diff --git a/tests/Auth/AuthDatabaseUserProviderTest.php b/tests/Auth/AuthDatabaseUserProviderTest.php
index e75cef6d6197..fd6b5be98305 100755
--- a/tests/Auth/AuthDatabaseUserProviderTest.php
+++ b/tests/Auth/AuthDatabaseUserProviderTest.php
@@ -102,6 +102,26 @@ public function testRetrieveByCredentialsReturnsUserWhenUserIsFound()
         $this->assertSame('taylor', $user->name);
     }
 
+    public function testRetrieveByCredentialsAcceptsCallback()
+    {
+        $conn = m::mock(Connection::class);
+        $conn->shouldReceive('table')->once()->with('foo')->andReturn($conn);
+        $conn->shouldReceive('where')->once()->with('username', 'dayle');
+        $conn->shouldReceive('whereIn')->once()->with('group', ['one', 'two']);
+        $conn->shouldReceive('first')->once()->andReturn(['id' => 1, 'name' => 'taylor']);
+        $hasher = m::mock(Hasher::class);
+        $provider = new DatabaseUserProvider($conn, $hasher, 'foo');
+
+        $user = $provider->retrieveByCredentials([function ($builder) {
+            $builder->where('username', 'dayle');
+            $builder->whereIn('group', ['one', 'two']);
+        }]);
+
+        $this->assertInstanceOf(GenericUser::class, $user);
+        $this->assertSame(1, $user->getAuthIdentifier());
+        $this->assertSame('taylor', $user->name);
+    }
+
     public function testRetrieveByCredentialsReturnsNullWhenUserIsFound()
     {
         $conn = m::mock(Connection::class);
diff --git a/tests/Auth/AuthEloquentUserProviderTest.php b/tests/Auth/AuthEloquentUserProviderTest.php
index ca9a08029b0e..ae34a1b4a074 100755
--- a/tests/Auth/AuthEloquentUserProviderTest.php
+++ b/tests/Auth/AuthEloquentUserProviderTest.php
@@ -100,6 +100,23 @@ public function testRetrieveByCredentialsReturnsUser()
         $this->assertSame('bar', $user);
     }
 
+    public function testRetrieveByCredentialsAcceptsCallback()
+    {
+        $provider = $this->getProviderMock();
+        $mock = m::mock(stdClass::class);
+        $mock->shouldReceive('newQuery')->once()->andReturn($mock);
+        $mock->shouldReceive('where')->once()->with('username', 'dayle');
+        $mock->shouldReceive('whereIn')->once()->with('group', ['one', 'two']);
+        $mock->shouldReceive('first')->once()->andReturn('bar');
+        $provider->expects($this->once())->method('createModel')->willReturn($mock);
+        $user = $provider->retrieveByCredentials([function ($builder) {
+            $builder->where('username', 'dayle');
+            $builder->whereIn('group', ['one', 'two']);
+        }]);
+
+        $this->assertSame('bar', $user);
+    }
+
     public function testCredentialValidation()
     {
         $hasher = m::mock(Hasher::class);