diff --git a/taskcluster/ci/test/reftest.yml b/taskcluster/ci/test/reftest.yml
index af90057ddf6a..5bffc5b65a98 100644
--- a/taskcluster/ci/test/reftest.yml
+++ b/taskcluster/ci/test/reftest.yml
@@ -92,10 +92,6 @@ reftest:
     description: "Reftest run"
     suite: reftest/reftest
     treeherder-symbol: R(R)
-    worker-type:
-        by-test-platform:
-            windows10-64.*: buildbot-bridge/buildbot-bridge
-            default: null
     run-on-projects:
         by-test-platform:
             .*-qr/.*: ['trunk', 'try']  # exclude beta and project branches
@@ -104,7 +100,10 @@ reftest:
         by-test-platform:
             android.*: xlarge
             default: default
-    virtualization: virtual-with-gpu
+    virtualization:
+        by-test-platform:
+            windows10.*: hardware
+            default: virtual-with-gpu
     chunks:
         by-test-platform:
             android-4.3-arm7-api-16/debug: 56
diff --git a/testing/mozharness/configs/unittests/win_taskcluster_unittest.py b/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
index bc2313041983..98caabaa8fb5 100644
--- a/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
+++ b/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
@@ -128,6 +128,7 @@ config = {
                 "--log-errorsummary=%(error_summary_file)s",
                 "--cleanup-crashes",
                 "--marionette-startup-timeout=180",
+                "--sandbox-read-whitelist=%(abs_work_dir)s",
             ],
             "run_filename": "runreftest.py",
             "testsdir": "reftest"