--- a/testing/web-platform/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/testing/web-platform/tests/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -563,17 +563,17 @@ class InternalRefTestImplementation(obje
         return rv
 
     def teardown(self):
         try:
             self.executor.protocol.marionette._send_message("reftest:teardown", {})
             self.executor.protocol.marionette.set_context(self.executor.protocol.marionette.CONTEXT_CONTENT)
         except Exception as e:
             # Ignore errors during teardown
-            self.logger.warning(traceback.traceback.format_exc(e))
+            self.logger.warning(traceback.format_exc(e))
 
 
 
 class GeckoDriverProtocol(WebDriverProtocol):
     server_cls = GeckoDriverServer
 
 
 class MarionetteWdspecExecutor(WdspecExecutor):