diff --git a/core/modules/file/src/Tests/FileOnTranslatedEntityTest.php b/core/modules/file/src/Tests/FileOnTranslatedEntityTest.php
index c9a3fb1..15dcc6f 100644
--- a/core/modules/file/src/Tests/FileOnTranslatedEntityTest.php
+++ b/core/modules/file/src/Tests/FileOnTranslatedEntityTest.php
@@ -90,7 +90,7 @@ public function testSyncedFiles() {
     // Edit the node to upload a file.
     $edit = array();
     $name = 'files[' . $this->fieldName . '_0]';
-    $edit[$name] = drupal_realpath($this->drupalGetTestFiles('text')[0]->uri);
+    $edit[$name] = $this->container->get('file_system')->realpath($this->drupalGetTestFiles('text')[0]->uri);
     $this->drupalPostForm('node/' . $default_language_node->id() . '/edit', $edit, t('Save'));
     $first_fid = $this->getLastFileId();
 
@@ -101,7 +101,7 @@ public function testSyncedFiles() {
     $edit = array();
     $edit['title[0][value]'] = 'Bill Murray';
     $name = 'files[' . $this->fieldName . '_0]';
-    $edit[$name] = drupal_realpath($this->drupalGetTestFiles('text')[1]->uri);
+    $edit[$name] = $this->container->get('file_system')->realpath($this->drupalGetTestFiles('text')[1]->uri);
     $this->drupalPostForm(NULL, $edit, t('Save (this translation)'));
     // This inspects the HTML after the post of the translation, the file
     // should be displayed on the original node.
@@ -127,7 +127,7 @@ public function testSyncedFiles() {
     $edit = array();
     $edit['title[0][value]'] = 'Scarlett Johansson';
     $name = 'files[' . $this->fieldName . '_0]';
-    $edit[$name] = drupal_realpath($this->drupalGetTestFiles('text')[2]->uri);
+    $edit[$name] = $this->container->get('file_system')->realpath($this->drupalGetTestFiles('text')[2]->uri);
     $this->drupalPostForm(NULL, $edit, t('Save (this translation)'));
     $third_fid = $this->getLastFileId();
 
@@ -155,7 +155,7 @@ public function testSyncedFiles() {
     $edit = array();
     $edit['title[0][value]'] = 'David Bowie';
     $name = 'files[' . $this->fieldName . '_0]';
-    $edit[$name] = drupal_realpath($this->drupalGetTestFiles('text')[3]->uri);
+    $edit[$name] = $this->container->get('file_system')->realpath($this->drupalGetTestFiles('text')[3]->uri);
     $this->drupalPostForm(NULL, $edit, t('Save (this translation)'));
     $replaced_second_fid = $this->getLastFileId();