diff --git a/tests/mockLogzioListener/listener.py b/tests/mockLogzioListener/listener.py
index df97218..213756f 100644
--- a/tests/mockLogzioListener/listener.py
+++ b/tests/mockLogzioListener/listener.py
@@ -73,7 +73,7 @@ class MockLogzioListener:
         return len(self.logs_list)
 
     def clear_logs_buffer(self):
-        self.logs_list = []
+        self.logs_list[:] = []
 
     def set_server_error(self):
         self.persistent_flags.set_server_error()
diff --git a/tests/test_logzioSender.py b/tests/test_logzioSender.py
index 9556e7f..420688b 100644
--- a/tests/test_logzioSender.py
+++ b/tests/test_logzioSender.py
@@ -21,6 +21,7 @@ def _find(pattern, path):
 class TestLogzioSender(TestCase):
     def setUp(self):
         self.logzio_listener = listener.MockLogzioListener()
+        self.logzio_listener.clear_logs_buffer()
         self.logzio_listener.clear_server_error()
         self.logs_drain_timeout = 1