diff --git a/tests/hermes_cli/test_gateway.py b/tests/hermes_cli/test_gateway.py
index a8cbfabf4c5..225947994d2 100644
--- a/tests/hermes_cli/test_gateway.py
+++ b/tests/hermes_cli/test_gateway.py
@@ -419,6 +419,15 @@ def test_find_gateway_pids_falls_back_to_pid_file_when_process_scan_fails(monkey
     monkeypatch.setattr(gateway, "is_windows", lambda: False)
     monkeypatch.setattr("gateway.status.get_running_pid", lambda: 321)
 
+    # /proc walk is the first path tried (#22693). Force os.listdir on /proc
+    # to raise so the function falls back to ps, where fake_run takes over.
+    _real_listdir = gateway.os.listdir
+    def _no_proc_listdir(path):
+        if path == "/proc":
+            raise OSError("test stub: /proc unavailable")
+        return _real_listdir(path)
+    monkeypatch.setattr(gateway.os, "listdir", _no_proc_listdir)
+
     def fake_run(cmd, **kwargs):
         if cmd[:4] == ["ps", "-A", "eww", "-o"]:
             return SimpleNamespace(returncode=1, stdout="", stderr="ps failed")