diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php b/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
index 0a1603e646cbf..1c84ff32c0b74 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
@@ -12,6 +12,7 @@
 namespace Symfony\Bridge\PhpUnit\Legacy;
 
 use PHPUnit\Framework\Test;
+use PHPUnit\Framework\TestCase;
 use PHPUnit\Framework\Warning;
 
 /**
@@ -36,6 +37,10 @@ public function __construct(callable $sutFqcnResolver = null, $warningOnSutNotFo
 
     public function startTest($test)
     {
+        if (!$test instanceof TestCase) {
+            return;
+        }
+
         $annotations = $test->getAnnotations();
 
         $ignoredAnnotations = array('covers', 'coversDefaultClass', 'coversNothing');