diff --git a/tests/test_base.py b/tests/test_base.py
index 2a92b67..868b6b1 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -348,8 +348,8 @@ class _TestBase:
         # format message
         msg = log.call_args[0][0] % log.call_args[0][1:]
 
-        # self.assertIn('Executing <Handle', msg)
-        # self.assertIn('test_debug_slow_callbacks', msg)
+        self.assertIn('Executing <TimerHandle', msg)
+        self.assertIn('test_debug_slow_timer_callbacks', msg)
 
     def test_default_exc_handler_callback(self):
         self.loop._process_events = mock.Mock()
diff --git a/uvloop/cbhandles.pyx b/uvloop/cbhandles.pyx
index 6d31382..0a30419 100644
--- a/uvloop/cbhandles.pyx
+++ b/uvloop/cbhandles.pyx
@@ -166,7 +166,6 @@ cdef class TimerHandle:
         if self.timer is None:
             return
 
-        self.callback = None
         self.args = None
 
         try: