diff --git a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservo.py b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservo.py
index 485cdc5c98d..01e201e2abe 100644
--- a/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservo.py
+++ b/tests/wpt/web-platform-tests/tools/wptrunner/wptrunner/executors/executorservo.py
@@ -33,6 +33,7 @@ def write_hosts_file(config):
 
 
 class ServoTestharnessExecutor(ProcessTestExecutor):
+    supports_testdriver = True
     convert_result = testharness_result_converter
 
     def __init__(self, browser, server_config, timeout_multiplier=1, debug_info=None,