diff --git a/tests/test_tui_gateway_server.py b/tests/test_tui_gateway_server.py
index 3b591156e28..6bf7fc4708e 100644
--- a/tests/test_tui_gateway_server.py
+++ b/tests/test_tui_gateway_server.py
@@ -4211,7 +4211,7 @@ def test_prompt_submit_sets_approval_session_key(monkeypatch):
             }
 
     class _ImmediateThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self._target = target
 
         def start(self):
@@ -4253,7 +4253,7 @@ def test_prompt_submit_expands_context_refs(monkeypatch):
             }
 
     class _ImmediateThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self._target = target
 
         def start(self):
@@ -5048,7 +5048,7 @@ def test_prompt_submit_history_version_mismatch_surfaces_warning(monkeypatch):
             }
 
     class _ImmediateThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self._target = target
 
         def start(self):
@@ -5151,7 +5151,7 @@ def test_prompt_submit_history_version_match_persists_normally(monkeypatch):
             }
 
     class _ImmediateThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self._target = target
 
         def start(self):
@@ -5210,7 +5210,7 @@ def test_prompt_submit_can_truncate_before_user_ordinal(monkeypatch):
             }
 
     class _ImmediateThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self._target = target
 
         def start(self):
@@ -5364,7 +5364,7 @@ def test_run_prompt_submit_registers_turn_thread_for_interrupt(monkeypatch):
     calls = {"interrupted": False, "started": False}
 
     class _FakeThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self.target = target
 
         def start(self):
@@ -5433,7 +5433,7 @@ def test_interrupt_before_agent_ready_prevents_late_turn_start(monkeypatch):
     calls = {"run_prompt": 0}
 
     class _FakeThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self.target = target
             threads.append(self)
 
@@ -6317,7 +6317,7 @@ def test_model_options_refresh_allows_custom_provider_probes(monkeypatch):
 class _ImmediateThread:
     """Runs the target callable synchronously so assertions can follow."""
 
-    def __init__(self, target=None, daemon=None):
+    def __init__(self, target=None, daemon=None, **kw):
         self._target = target
 
     def start(self):
@@ -7832,7 +7832,7 @@ def test_notification_poller_delivers_completion(monkeypatch):
             }
 
     class _ImmediateThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self._target = target
         def start(self):
             self._target()
@@ -7900,7 +7900,7 @@ def test_notification_poller_skips_consumed(monkeypatch):
             return {"final_response": "ok", "messages": []}
 
     class _ImmediateThread:
-        def __init__(self, target=None, daemon=None):
+        def __init__(self, target=None, daemon=None, **kw):
             self._target = target
         def start(self):
             self._target()