diff --git a/testing/web-platform/mach_commands.py b/testing/web-platform/mach_commands.py
index 3190c5d28823..3889689d1bbc 100644
--- a/testing/web-platform/mach_commands.py
+++ b/testing/web-platform/mach_commands.py
@@ -129,7 +129,11 @@ class WebPlatformTestsRunnerSetup(MozbuildObject):
 
 class WebPlatformTestsUpdater(MozbuildObject):
     """Update web platform tests."""
-    def run_update(self, **kwargs):
+    def setup_logging(self, **kwargs):
+        import update
+        return update.setup_logging(kwargs, {"mach": sys.stdout})
+
+    def run_update(self, logger, **kwargs):
         import update
         from update import updatecommandline
 
@@ -141,7 +145,6 @@ class WebPlatformTestsUpdater(MozbuildObject):
         kwargs["store_state"] = False
 
         kwargs = updatecommandline.check_args(kwargs)
-        logger = update.setup_logging(kwargs, {"mach": sys.stdout})
 
         try:
             update.run_update(logger, **kwargs)
@@ -269,24 +272,26 @@ testing/web-platform/tests for tests that may be shared
         if proc:
             proc.wait()
 
-        context.commands.dispatch("wpt-manifest-update", context)
-
 
 class WPTManifestUpdater(MozbuildObject):
-    def run_update(self, rebuild=False, **kwargs):
-        import manifestupdate
+    def setup_logging(self, **kwargs):
         from wptrunner import wptlogging
         logger = wptlogging.setup(kwargs, {"mach": sys.stdout})
+
+    def run_update(self, logger, rebuild=False, **kwargs):
+        import manifestupdate
         wpt_dir = os.path.abspath(os.path.join(self.topsrcdir, 'testing', 'web-platform'))
         config_dir = os.path.abspath(os.path.join(self.topobjdir, '_tests', 'web-platform'))
         manifestupdate.update(logger, wpt_dir, rebuild, config_dir)
 
 
 class WPTManifestDownloader(MozbuildObject):
-    def run_download(self, manifest_update=True, force=False, **kwargs):
-        import manifestdownload
+    def setup_logging(self, **kwargs):
         from wptrunner import wptlogging
         logger = wptlogging.setup(kwargs, {"mach": sys.stdout})
+
+    def run_download(self, logger, manifest_update=True, force=False, **kwargs):
+        import manifestdownload
         wpt_dir = os.path.abspath(os.path.join(self.topobjdir, '_tests', 'web-platform'))
         manifestdownload.run(wpt_dir, self.topsrcdir, logger, force, manifest_update)
 
@@ -347,11 +352,14 @@ class MachCommands(MachCommandBase):
                 params["include"].append(item["name"])
             del params["test_objects"]
 
-        self.wpt_manifest_download(**params)
-        params["manifest_update"] = False
         wpt_setup = self._spawn(WebPlatformTestsRunnerSetup)
         wpt_runner = WebPlatformTestsRunner(wpt_setup)
-        return wpt_runner.run(**params)
+
+        logger = wpt_runner.setup_logging(**params)
+
+        self.wpt_manifest_download(logger, **params)
+        params["manifest_update"] = False
+        return wpt_runner.run(logger, **params)
 
     @Command("wpt",
              category="testing",
@@ -368,8 +376,10 @@ class MachCommands(MachCommandBase):
         self.virtualenv_manager.install_pip_package('html5lib==1.0.1')
         self.virtualenv_manager.install_pip_package('ujson')
         self.virtualenv_manager.install_pip_package('requests')
+
         wpt_updater = self._spawn(WebPlatformTestsUpdater)
-        return wpt_updater.run_update(**params)
+        logger = wpt_updater.setup_logging(**params)
+        return wpt_updater.run_update(logger, **params)
 
     @Command("wpt-update",
              category="testing",
@@ -398,12 +408,17 @@ class MachCommands(MachCommandBase):
         self.setup()
         self.wpt_manifest_download(**params)
         wpt_manifest_updater = self._spawn(WPTManifestUpdater)
-        return wpt_manifest_updater.run_update(**params)
+        logger = wpt_manifest_updater.setup_logging(**params)
+        self.wpt_manifest_download(logger, **params)
+        return wpt_manifest_updater.run_update(logger, **params)
 
     @Command("wpt-manifest-download",
              category="testing",
              parser=create_parser_manifest_download)
-    def wpt_manifest_download(self, **params):
+    def wpt_manifest_download(self, logger=None, **params):
         self.setup()
+        if logger is None:
+            from wptrunner import wptlogging
+            logger = wptlogging.setup(params, {"mach": sys.stdout})
         wpt_manifest_downloader = self._spawn(WPTManifestDownloader)
-        return wpt_manifest_downloader.run_download(**params)
+        return wpt_manifest_downloader.run_download(logger, **params)
diff --git a/testing/web-platform/mach_commands_base.py b/testing/web-platform/mach_commands_base.py
index ee339d480d01..34644b09bf6c 100644
--- a/testing/web-platform/mach_commands_base.py
+++ b/testing/web-platform/mach_commands_base.py
@@ -16,7 +16,11 @@ class WebPlatformTestsRunner(object):
     def __init__(self, setup):
         self.setup = setup
 
-    def run(self, **kwargs):
+    def setup_logging(self, **kwargs):
+        from wptrunner import wptrunner
+        return wptrunner.setup_logging(kwargs, {self.setup.default_log_type: sys.stdout})
+
+    def run(self, logger, **kwargs):
         from wptrunner import wptrunner
         if kwargs["product"] in ["firefox", None]:
             kwargs = self.setup.kwargs_firefox(kwargs)
@@ -27,6 +31,5 @@ class WebPlatformTestsRunner(object):
             kwargs = self.setup.kwargs_wptrun(kwargs)
         else:
             raise ValueError("Unknown product %s" % kwargs["product"])
-        logger = wptrunner.setup_logging(kwargs, {self.setup.default_log_type: sys.stdout})
         result = wptrunner.start(**kwargs)
         return int(not result)