--- a/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
+++ b/testing/mozharness/configs/unittests/win_taskcluster_unittest.py
@@ -191,16 +191,21 @@ config = {
         "jsreftest": {
             'options':["--extra-profile-file=tests/jsreftest/tests/user.js"],
             'tests': ["tests/jsreftest/tests/jstests.list"]
         },
         "reftest": {
             'options': ["--suite=reftest"],
             'tests': ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
+        "reftest-gpu": {
+            'options': ["--suite=reftest",
+                        "--setpref=layers.gpu-process.force-enabled=true"],
+            'tests': ["tests/reftest/tests/layout/reftests/reftest.list"]
+        },
         "reftest-no-accel": {
             "options": ["--suite=reftest",
                         "--setpref=gfx.direct2d.disabled=true",
                         "--setpref=layers.acceleration.disabled=true"],
             "tests": ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
     },
     "all_xpcshell_suites": {

--- a/testing/mozharness/configs/unittests/win_unittest.py
+++ b/testing/mozharness/configs/unittests/win_unittest.py
@@ -191,16 +191,21 @@ config = {
         "jsreftest": {
             'options':["--extra-profile-file=tests/jsreftest/tests/user.js"],
             'tests': ["tests/jsreftest/tests/jstests.list"]
         },
         "reftest": {
             'options': ["--suite=reftest"],
             'tests': ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
+        "reftest-gpu": {
+            'options': ["--suite=reftest",
+                        "--setpref=layers.gpu-process.force-enabled=true"],
+            'tests': ["tests/reftest/tests/layout/reftests/reftest.list"]
+        },
         "reftest-no-accel": {
             "options": ["--suite=reftest",
                         "--setpref=gfx.direct2d.disabled=true",
                         "--setpref=layers.acceleration.disabled=true"],
             "tests": ["tests/reftest/tests/layout/reftests/reftest.list"]
         },
     },
     "all_xpcshell_suites": {