diff --git a/archivebox/opencode/views.py b/archivebox/opencode/views.py
index f5c33108..2a541a3e 100644
--- a/archivebox/opencode/views.py
+++ b/archivebox/opencode/views.py
@@ -5,6 +5,7 @@ import base64
 import logging
 import os
 import re
+import signal
 import shutil
 import subprocess
 import threading
@@ -85,17 +86,27 @@ You are running inside an ArchiveBox collection directory.
 """
 
 
+def _signal_owned_process(process: subprocess.Popen, sig: signal.Signals) -> None:
+    try:
+        os.killpg(process.pid, sig)
+    except OSError:
+        try:
+            process.send_signal(sig)
+        except ProcessLookupError:
+            pass
+
+
 def _stop_owned_process(process: subprocess.Popen | None = None) -> None:
     global _PROCESS
     owned_process = process or _PROCESS
     if owned_process is None:
         return
     if owned_process.poll() is None:
-        owned_process.terminate()
+        _signal_owned_process(owned_process, signal.SIGTERM)
         try:
             owned_process.wait(timeout=5)
         except subprocess.TimeoutExpired:
-            owned_process.kill()
+            _signal_owned_process(owned_process, signal.SIGKILL)
             owned_process.wait()
     if _PROCESS is owned_process:
         _PROCESS = None
diff --git a/archivebox/tests/test_opencode_agent.py b/archivebox/tests/test_opencode_agent.py
index bf1c670e..2ead6d81 100644
--- a/archivebox/tests/test_opencode_agent.py
+++ b/archivebox/tests/test_opencode_agent.py
@@ -1,5 +1,6 @@
 import os
 import socket
+import subprocess
 from concurrent.futures import ThreadPoolExecutor
 from pathlib import Path
 from types import SimpleNamespace
@@ -105,10 +106,7 @@ def live_opencode(opencode_archive_config):
     try:
         yield SimpleNamespace(config=opencode_archive_config, settings=settings, process=process)
     finally:
-        if views._PROCESS and views._PROCESS.poll() is None:
-            views._PROCESS.terminate()
-            views._PROCESS.wait(timeout=10)
-        views._PROCESS = None
+        views._stop_owned_process()
 
 
 def test_opencode_disabled_route_does_not_start_server(client, initialized_archive):
@@ -126,6 +124,19 @@ def test_opencode_disabled_route_does_not_start_server(client, initialized_archi
     assert views._PROCESS is None or views._PROCESS.poll() is not None
 
 
+def test_stop_owned_process_falls_back_when_process_has_no_dedicated_group():
+    from archivebox.opencode import views
+
+    process = subprocess.Popen(["sleep", "60"])
+    try:
+        views._stop_owned_process(process)
+        assert process.poll() is not None
+    finally:
+        if process.poll() is None:
+            process.kill()
+            process.wait()
+
+
 def test_opencode_agent_requires_superuser_when_enabled(client, db, django_user_model, live_opencode):
     response = client.get("/admin/agent", HTTP_HOST=ADMIN_TEST_HOST)
     assert response.status_code == 302