diff --git a/tests.py b/tests.py
index 424679f..4991920 100644
--- a/tests.py
+++ b/tests.py
@@ -187,6 +187,7 @@ class TestMethods(unittest.TestCase):
                     except KeyError:
                         result[flow.application_name] = flow.total_bytes
             self.assertEqual(result, ground_truth_ndpi[test_case_name])
+            del streamer_test
             print('PASS.')
 
     def test_expiration_management(self):