diff --git a/tests/__init__.py b/tests/__init__.py
index 5b8c4b3..003de47 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -300,8 +300,12 @@ class Modeltests(unittest.TestCase):
         #  anymore
         self.worker.kill()
         self.worker.wait()
+        self.worker = None
+        self.workerlog.close()
+        self.workerlog = None
         self.broker.kill()
         self.broker.wait()
+        self.broker = None
 
         # Remove testdir
         shutil.rmtree(self.path)