diff --git a/lib/Cake/TestSuite/Reporter/HtmlReporter.php b/lib/Cake/TestSuite/Reporter/HtmlReporter.php
index a535aba3b94..580db1f8f1f 100644
--- a/lib/Cake/TestSuite/Reporter/HtmlReporter.php
+++ b/lib/Cake/TestSuite/Reporter/HtmlReporter.php
@@ -22,6 +22,7 @@
 use Cake\Core\Configure;
 use Cake\TestSuite\Coverage\HtmlCoverageReport;
 use Cake\Utility\Inflector;
+use PHPUnit_Util_Diff;
 
 /**
  * HtmlReporter Reports Results of TestSuites and Test Cases