--- a/testing/web-platform/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/testing/web-platform/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -513,17 +513,17 @@ class MarionetteRefTestExecutor(RefTestE
     def teardown(self):
         try:
             self.implementation.teardown()
             handle = self.protocol.marionette.window_handles[0]
             self.protocol.marionette.switch_to_window(handle)
             super(self.__class__, self).teardown()
         except Exception as e:
             # Ignore errors during teardown
-            self.logger.warning(traceback.traceback.format_exc(e))
+            self.logger.warning(traceback.format_exc(e))
 
     def is_alive(self):
         return self.protocol.is_alive
 
     def on_environment_change(self, new_environment):
         self.protocol.on_environment_change(self.last_environment, new_environment)
 
     def do_test(self, test):