diff --git a/queue_job/tests/common.py b/queue_job/tests/common.py
index 6b52cfba7f..f25739be69 100644
--- a/queue_job/tests/common.py
+++ b/queue_job/tests/common.py
@@ -227,13 +227,13 @@ def perform_enqueued_jobs(self):
         def by_graph(job):
             return job.graph_uuid or ""
 
-        sorted_jobs = sorted(self.enqueued_jobs, key=by_graph)
+        sorted_jobs = sorted(self.enqueued_jobs[:], key=by_graph)
+        self.enqueued_jobs = []
         for graph_uuid, jobs in groupby(sorted_jobs, key=by_graph):
             if graph_uuid:
                 self._perform_graph_jobs(jobs)
             else:
                 self._perform_single_jobs(jobs)
-        self.enqueued_jobs = []
 
     def _perform_single_jobs(self, jobs):
         # we probably don't want to replicate a perfect order here, but at