diff --git a/core/modules/file/lib/Drupal/file/Tests/SaveUploadTest.php b/core/modules/file/lib/Drupal/file/Tests/SaveUploadTest.php
index 0a23359..73ba50c 100644
--- a/core/modules/file/lib/Drupal/file/Tests/SaveUploadTest.php
+++ b/core/modules/file/lib/Drupal/file/Tests/SaveUploadTest.php
@@ -194,7 +194,7 @@ function testHandleDangerousFile() {
     $this->assertResponse(200, 'Received a 200 response for posted test file.');
     $message = t('For security reasons, your upload has been renamed to') . ' <em class="placeholder">' . $this->phpfile->filename . '.txt' . '</em>';
     $this->assertRaw($message, 'Dangerous file was renamed.');
-    $this->assertRaw(t('File MIME type is text/plain.'), "Dangerous file\'s MIME type was changed.");
+    $this->assertRaw(t('File MIME type is text/plain.'), "Dangerous file's MIME type was changed.");
     $this->assertRaw(t('You WIN!'), 'Found the success message.');
 
     // Check that the correct hooks were called.