diff --git a/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php b/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php
index 77b471f..273d593 100644
--- a/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php
+++ b/core/modules/migrate/src/Plugin/migrate/destination/EntityFile.php
@@ -44,11 +44,7 @@ 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']);
-
-    // 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;
+    $source = $this->configuration['source_base_path'] . $file;
 
     $dirname = drupal_dirname($destination);
     if (!file_prepare_directory($dirname, FILE_CREATE_DIRECTORY)) {
@@ -114,18 +110,4 @@ protected function urlencode($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 3cb5bc6..e646331 100644
--- a/core/modules/migrate/tests/src/Unit/destination/EntityFileTest.php
+++ b/core/modules/migrate/tests/src/Unit/destination/EntityFileTest.php
@@ -72,6 +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 an 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.