diff --git a/src/Framework/TestSuite.php b/src/Framework/TestSuite.php
index 4f30cd0983e..acab5f94489 100644
--- a/src/Framework/TestSuite.php
+++ b/src/Framework/TestSuite.php
@@ -359,6 +359,7 @@ public function addTestFile(string $filename): void
                 new PhptTestCase($filename)
             );
 
+            $this->declaredClasses = \get_declared_classes();
             return;
         }