--- a/taskcluster/taskgraph/transforms/coalesce.py
+++ b/taskcluster/taskgraph/transforms/coalesce.py
@@ -30,15 +30,16 @@ def enable_coalescing(config, jobs):
         if int(config.params['level']) > 1 and job['worker-type'] not in [
             # These worker types don't currently support coalescing.
             # This list can be removed when bug 1399401 is fixed:
             #   https://bugzilla.mozilla.org/show_bug.cgi?id=1399401
             'aws-provisioner-v1/gecko-t-win7-32',
             'aws-provisioner-v1/gecko-t-win7-32-gpu',
             'aws-provisioner-v1/gecko-t-win10-64',
             'aws-provisioner-v1/gecko-t-win10-64-gpu',
+            'releng-hardware/gecko-t-win10-64-hw',
         ]:
             job['coalesce'] = {
                 'job-identifier': sha256(job["label"]).hexdigest()[:20],
                 'age': 3600,
                 'size': 5,
             }
         yield job