diff --git a/queue_job/controllers/main.py b/queue_job/controllers/main.py
index e47461eab0..8cbdb61f46 100644
--- a/queue_job/controllers/main.py
+++ b/queue_job/controllers/main.py
@@ -148,6 +148,12 @@ def retry_postpone(job, message, seconds=None):
             # traceback in the logs we should have the traceback when all
             # retries are exhausted
             env.cr.rollback()
+            # A postponed job is not done: it must not release its dependent
+            # jobs. Returning here also avoids calling _enqueue_dependent_jobs
+            # with job.env pointing to the now-closed cursor that
+            # retry_postpone() opened and closed, which would raise
+            # "Unable to use a closed cursor".
+            return ""
 
         except (FailedJobError, Exception) as orig_exception:
             buff = StringIO()