diff --git a/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php b/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php
index 77b471f..e3bcbaa 100644
--- a/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php
+++ b/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php
@@ -9,10 +9,13 @@
 
 use Drupal\Core\Entity\EntityManagerInterface;
 use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\File\FileSystemInterface;
+use Drupal\Core\StreamWrapper\LocalStream;
+use Drupal\Core\StreamWrapper\StreamWrapperManagerInterface;
 use Drupal\migrate\Entity\MigrationInterface;
-use Drupal\migrate\Plugin\MigratePluginManager;
 use Drupal\migrate\Row;
 use Drupal\migrate\MigrateException;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
  * Every migration that uses this destination must have an optional
@@ -25,9 +28,19 @@
 class EntityFile extends EntityContentBase {
 
   /**
+   * @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface
+   */
+  protected $streamWrappers;
+
+  /**
+   * @var \Drupal\Core\File\FileSystemInterface
+   */
+  protected $fileSystem;
+
+  /**
    * {@inheritdoc}
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EntityStorageInterface $storage, array $bundles, EntityManagerInterface $entity_manager) {
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, EntityStorageInterface $storage, array $bundles, EntityManagerInterface $entity_manager, StreamWrapperManagerInterface $stream_wrappers, FileSystemInterface $file_system) {
     $configuration += array(
       'source_base_path' => '',
       'source_path_property' => 'filepath',
@@ -36,6 +49,27 @@ public function __construct(array $configuration, $plugin_id, $plugin_definition
       'urlencode' => FALSE,
     );
     parent::__construct($configuration, $plugin_id, $plugin_definition, $migration, $storage, $bundles, $entity_manager);
+
+    $this->streamWrappers = $stream_wrappers;
+    $this->fileSystem = $file_system;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
+    $entity_type = static::getEntityTypeId($plugin_id);
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $migration,
+      $container->get('entity.manager')->getStorage($entity_type),
+      array_keys($container->get('entity.manager')->getBundleInfo($entity_type)),
+      $container->get('entity.manager'),
+      $container->get('stream_wrapper_manager'),
+      $container->get('file_system')
+    );
   }
 
   /**
@@ -44,19 +78,24 @@ public function __construct(array $configuration, $plugin_id, $plugin_definition
   public function import(Row $row, array $old_destination_id_values = array()) {
     $file = $row->getSourceProperty($this->configuration['source_path_property']);
     $destination = $row->getDestinationProperty($this->configuration['destination_path_property']);
+    $source = $this->configuration['source_base_path'] . $file;
 
-    // We check the destination to see if this is a temporary file. If it is
-    // then we do not prepend the source_base_path because temporary files are
-    // already absolute.
-    $source = $this->isTempFile($destination) ? $file : $this->configuration['source_base_path'] . $file;
-
-    $dirname = drupal_dirname($destination);
+    $dirname = $this->fileSystem->dirname($destination);
+    // It's pretty safe to assume that $source exists. $destination, on the
+    // other hand, might not. So we need to do a little dancing to prepare
+    // the destination path. The issue is that, for URIs like public://foo.txt,
+    // FileSystemInterface::dirname() will return public:// -- which will
+    // be roundly rejected by file_prepare_directory(). So if dirname() returned
+    // such a URI, translate it to a path for file_prepare_directory().
+    if (substr($dirname, -3) == '://') {
+      $dirname = $this->fileSystem->realpath($dirname);
+    }
     if (!file_prepare_directory($dirname, FILE_CREATE_DIRECTORY)) {
       throw new MigrateException(t('Could not create directory %dirname', array('%dirname' => $dirname)));
     }
 
     // If the start and end file is exactly the same, there is nothing to do.
-    if (drupal_realpath($source) === drupal_realpath($destination)) {
+    if ($this->isLocationUnchanged($source, $destination)) {
       return parent::import($row, $old_destination_id_values);
     }
 
@@ -90,6 +129,42 @@ public function import(Row $row, array $old_destination_id_values = array()) {
   }
 
   /**
+   * Returns if the source and destination URIs represent identical paths.
+   * If either URI is a remote stream, will return FALSE.
+   *
+   * @param string $source
+   *  The source URI.
+   * @param string $destination
+   *  The destination URI.
+   *
+   * @return boolean
+   */
+  protected function isLocationUnchanged($source, $destination) {
+    if ($this->isLocalTransfer($source, $destination)) {
+      return $this->fileSystem->realpath($source) === $this->fileSystem->realpath($destination);
+    }
+    else {
+      return FALSE;
+    }
+  }
+
+  /**
+   * Returns if both the source and destination URIs are local streams.
+   *
+   * @param string $source
+   *  The source URI.
+   * @param string $destination
+   *  The destination URI.
+   *
+   * @return boolean
+   */
+  protected function isLocalTransfer($source, $destination) {
+    return
+      $this->streamWrappers->getViaUri($source) instanceof LocalStream
+      && $this->streamWrappers->getViaUri($destination) instanceof LocalStream;
+  }
+
+  /**
    * Urlencode all the components of a remote filename.
    *
    * @param string $filename
@@ -114,18 +189,4 @@ protected function urlencode($filename) {
     return $filename;
   }
 
-  /**
-   * Check if a file is a temp file.
-   *
-   * @param string $file
-   *   The destination file path.
-   *
-   * @return bool
-   *   TRUE if the file is temporary otherwise FALSE.
-   */
-  protected function isTempFile($file) {
-    $tmp = 'temporary://';
-    return substr($file, 0, strlen($tmp)) === $tmp;
-  }
-
 }
diff --git a/core/modules/migrate/tests/src/Unit/destination/EntityFileTest.php b/core/modules/migrate/tests/src/Unit/destination/EntityFileTest.php
index 731c722..c6dd342 100644
--- a/core/modules/migrate/tests/src/Unit/destination/EntityFileTest.php
+++ b/core/modules/migrate/tests/src/Unit/destination/EntityFileTest.php
@@ -39,6 +39,8 @@ class EntityFileTest extends KernelTestBase {
   public function setUp() {
     parent::setUp();
     $this->destination = new TestEntityFile([]);
+    $this->destination->streamWrappers = \Drupal::getContainer()->get('stream_wrapper_manager');
+    $this->destination->fileSystem = \Drupal::getContainer()->get('file_system');
 
     $this->installConfig(['system']);
     file_put_contents('/tmp/test-file.jpg', '');
@@ -70,6 +72,8 @@ protected function localFileDataProvider() {
       [['filepath' => 'core/modules/simpletest/files/image-test.jpg'], 'public://file1.jpg', TRUE, DRUPAL_ROOT . '/'],
       // Test a temporary file using an absolute path.
       [['filepath' => '/tmp/test-file.jpg'], 'temporary://test.jpg', TRUE, ''],
+      // Test a temporary file using a relative path.
+      [['filepath' => 'test-file.jpg'], 'temporary://core/modules/simpletest/files/test.jpg', TRUE, '/tmp/'],
       // Test a remote path to local.
       [['filepath' => 'core/modules/simpletest/files/image-test.jpg'], 'public://remote-file.jpg', TRUE, $base_url . '/'],
       // Test a remote path to local inside a folder that doesn't exist.
@@ -77,17 +81,20 @@ protected function localFileDataProvider() {
     ];
   }
 
-
   /**
    * Test that non-existent files throw an exception.
    */
   public function testNonExistentSourceFile() {
+    $destination = '/non/existent/file';
     try {
-      $this->doImport(['filepath' => '/none/existent/file'], 'public://wontmatter.jpg');
+      // If this test passes, doImport() will raise a MigrateException and
+      // we'll never reach fail().
+      $this->doImport(['filepath' => $destination], 'public://wontmatter.jpg');
+      $this->fail('Expected Drupal\migrate\MigrateException when importing ' . $destination);
+    }
+    catch (MigrateException $e) {
+      $this->assertIdentical($e->getMessage(), 'File <em class="placeholder">' . $destination . '</em> could not be copied to <em class="placeholder">public://wontmatter.jpg</em>.');
     }
-    catch (MigrateException $e) {}
-    $destination = '/none/existent/file';
-    $this->assertIdentical($e->getMessage(), 'File <em class="placeholder">' . $destination . '</em> could not be copied to <em class="placeholder">public://wontmatter.jpg</em>.');
   }
 
   /**
@@ -132,6 +139,16 @@ class TestEntityFile extends EntityFile {
    */
   public $configuration;
 
+  /**
+   * @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface
+   */
+  public $streamWrappers;
+
+  /**
+   * @var \Drupal\Core\File\FileSystemInterface
+   */
+  public $fileSystem;
+
   public function __construct($configuration) {
     $configuration +=  array(
       'source_base_path' => '',
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FileUri.php b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FileUri.php
index 722cc96..b768809 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FileUri.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/FileUri.php
@@ -24,7 +24,6 @@ class FileUri extends ProcessPluginBase {
    * {@inheritdoc}
    */
   public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
-
     list($filepath, $file_directory_path, $temp_directory_path, $is_public) = $value;
 
     // Specific handling using $temp_directory_path for temporary files.