--- a/taskcluster/taskgraph/action.py
+++ b/taskcluster/taskgraph/action.py
@@ -70,29 +70,35 @@ def backfill(project, job_id):
      * Scheduling backfill jobs from a given treeherder resultset backwards until either
      a successful job is found or `N` jobs have been scheduled.
     """
     s = requests.Session()
     s.headers.update({"User-Agent": "gecko-intree-backfill-task"})
 
     job = s.get(url="{}/project/{}/jobs/{}/".format(TREEHERDER_URL, project, job_id)).json()
 
-    if job["build_system_type"] != "taskcluster":
-        logger.warning("Invalid build system type! Must be a Taskcluster job. Aborting.")
-        return
+    job_type_name = job['job_type_name']
+
+    if job['build_system_type'] != 'taskcluster':
+        if 'Created by BBB for task' not in job['reason']:
+            logger.warning("Invalid build system type! Must be a Taskcluster job. Aborting.")
+            return
+        task_id = job['reason'].split(' ')[-1]
+        task = requests.get("https://queue.taskcluster.net/v1/task/{}".format(task_id)).json()
+        job_type_name = task['metadata']['name']
 
     filters = dict((k, job[k]) for k in ("build_platform_id", "platform_option", "job_type_id"))
 
     resultset_url = "{}/project/{}/resultset/".format(TREEHERDER_URL, project)
     params = {"id__lt": job["result_set_id"], "count": MAX_BACKFILL_RESULTSETS}
     results = s.get(url=resultset_url, params=params).json()["results"]
     resultsets = [resultset["id"] for resultset in results]
 
     for decision in load_decisions(s, project, resultsets, filters):
-        add_tasks(decision, [job["job_type_name"]], '{}-'.format(decision))
+        add_tasks(decision, [job_type_name], '{}-'.format(decision))
 
 
 def add_talos(decision_task_id, times=1):
     """
     Run the add-talos task.  This function implements `mach taskgraph add-talos`,
     and is responsible for
 
      * Adding all talos jobs to a push.