diff --git a/queue_job/controllers/main.py b/queue_job/controllers/main.py
index b4a5a596c..46da185d4 100644
--- a/queue_job/controllers/main.py
+++ b/queue_job/controllers/main.py
@@ -214,7 +214,8 @@ def _get_failure_values(cls, job, traceback_txt, orig_exception):
         readonly=False,
     )
     def runjob(self, job_uuid, **kw):
-        env = http.request.env(user=SUPERUSER_ID)
+        http.request.update_env(user=SUPERUSER_ID)
+        env = http.request.env
         job = self._acquire_job(env, job_uuid)
         if not job:
             return ""
diff --git a/queue_job/tests/__init__.py b/queue_job/tests/__init__.py
index 16bcdff96..696549a65 100644
--- a/queue_job/tests/__init__.py
+++ b/queue_job/tests/__init__.py
@@ -1,3 +1,4 @@
+from . import test_run_job_controller_http
 from . import test_run_rob_controller
 from . import test_runner_channels
 from . import test_runner_runner
diff --git a/queue_job/tests/test_run_job_controller_http.py b/queue_job/tests/test_run_job_controller_http.py
new file mode 100644
index 000000000..5ad88c1b8
--- /dev/null
+++ b/queue_job/tests/test_run_job_controller_http.py
@@ -0,0 +1,85 @@
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from unittest import mock
+
+from odoo import SUPERUSER_ID, http
+from odoo.tests.common import HttpCase, tagged
+
+from ..controllers.main import RunJobController
+
+
+@tagged("-at_install", "post_install")
+class TestRunJobHttp(HttpCase):
+    """End-to-end tests for the ``/queue_job/runjob`` endpoint.
+
+    ``runjob`` is declared ``auth="none"``, so ``_auth_method_none`` pins
+    ``transaction.default_env`` to an env with ``uid=None``. The controller
+    must additionally repoint ``default_env`` to a superuser env, otherwise
+    any flush during ``job.perform()`` that goes through
+    ``Transaction.flush() -> default_env.flush_all()`` recomputes stored
+    fields with ``self.env.user`` as an empty recordset. See #922.
+    """
+
+    def _capture_default_env_uid_at_acquire(self):
+        """Hit ``/queue_job/runjob`` and observe ``transaction.default_env.uid``
+        at the moment ``_acquire_job`` is entered.
+
+        ``_acquire_job`` is patched to return ``None`` so the endpoint exits
+        without performing the job. This avoids the commit inside
+        ``_acquire_job``, which is forbidden inside tests, and is sufficient
+        to observe the env state established by the request-handling
+        machinery: nothing between ``update_env`` and ``_acquire_job``
+        touches ``transaction.default_env``, so the value seen here is the
+        same value a job would see at ``perform()`` time.
+
+        HttpCase runs the HTTP server in the same process, so class-level
+        ``mock.patch`` calls take effect on the server side as well.
+        """
+        captured = {}
+
+        def spy(cls, env, job_uuid):
+            captured["default_env_uid"] = env.transaction.default_env.uid
+            return None
+
+        with mock.patch.object(RunJobController, "_acquire_job", classmethod(spy)):
+            response = self.url_open(
+                f"/queue_job/runjob?db={self.env.cr.dbname}&job_uuid=stub"
+            )
+            response.raise_for_status()
+
+        return captured.get("default_env_uid")
+
+    def test_runjob_pins_default_env_to_superuser(self):
+        """``runjob`` must set ``transaction.default_env`` to a superuser env.
+
+        Verifies that by the time ``_acquire_job`` is entered,
+        ``env.transaction.default_env.uid`` is ``SUPERUSER_ID``. This is the
+        state that lets flushes triggered by the job recompute stored fields
+        with a real ``self.env.user`` rather than an empty recordset.
+        """
+        default_env_uid = self._capture_default_env_uid_at_acquire()
+        self.assertEqual(default_env_uid, SUPERUSER_ID)
+
+    def test_runjob_without_updating_default_env_leaves_uid_none(self):
+        """Repointing ``default_env`` is the specific mechanism this relies on.
+
+        Neutralises ``http.request.update_env`` for the duration of the
+        request, matching what happens if a ``runjob`` implementation only
+        obtains a local superuser env via ``http.request.env(user=...)``
+        without invoking ``update_env``. The observable ``default_env.uid``
+        then remains at the ``None`` value installed by
+        ``_auth_method_none``. This isolates ``default_env`` repointing as
+        the load-bearing behavior of ``runjob``: any future refactor that
+        drops it will trip this test.
+        """
+
+        def no_op_update_env(self_, user=None, context=None, su=None):
+            """Alternative ``Request.update_env`` that intentionally does
+            nothing. Simulates a controller that never asks the request to
+            update its environment.
+            """
+
+        with mock.patch.object(http.Request, "update_env", no_op_update_env):
+            default_env_uid = self._capture_default_env_uid_at_acquire()
+
+        self.assertIsNone(default_env_uid)