diff --git a/core/modules/simpletest/src/Tests/UiPhpUnitOutputTest.php b/core/modules/simpletest/src/Tests/UiPhpUnitOutputTest.php
index c2ebfc92c4..e032cef941 100644
--- a/core/modules/simpletest/src/Tests/UiPhpUnitOutputTest.php
+++ b/core/modules/simpletest/src/Tests/UiPhpUnitOutputTest.php
@@ -35,9 +35,9 @@ public function testOutput() {
 
     // Check that there are <br> tags for the HTML output by
     // SimpletestUiPrinter.
-    $this->assertEqual($output[20], 'HTML output was generated<br />');
+    $this->assertEqual($output[19], 'HTML output was generated<br />');
     // Check that URLs are printed as HTML links.
-    $this->assertIdentical(strpos($output[21], '<a href="http'), 0);
+    $this->assertIdentical(strpos($output[20], '<a href="http'), 0);
   }
 
 }