diff --git a/bibtexbrowser-test.php b/bibtexbrowser-test.php
index 2d7c72d..9337a11 100755
--- a/bibtexbrowser-test.php
+++ b/bibtexbrowser-test.php
@@ -11,7 +11,7 @@ $ phpunit --coverage-html ./coverage btb-test.php
 */
 
 // backward compatibility
-if (!class_exists('PHPUnit_Framework_TestCase')) {
+if (!class_exists('PHPUnit_Framework_TestCase')) { //
     class_alias('\PHPUnit\Framework\TestCase', 'PHPUnit_Framework_TestCase');
 }