--- a/testing/mozharness/configs/unittests/linux_unittest.py
+++ b/testing/mozharness/configs/unittests/linux_unittest.py
@@ -111,16 +111,17 @@ config = {
                 "--setpref=webgl.force-enabled=true",
                 "--quiet",
                 "--log-raw=%(raw_log_file)s",
                 "--log-errorsummary=%(error_summary_file)s",
                 "--use-test-media-devices",
                 "--screenshot-on-fail",
                 "--cleanup-crashes",
                 "--marionette-startup-timeout=180",
+                "--marionette-port-timeout=180"
                 "--work-path=%(abs_work_dir)s",
             ],
             "run_filename": "runtests.py",
             "testsdir": "mochitest"
         },
         "mozbase": {
             "options": [
                 "-b",