diff --git a/tests/unit/browser/test_browser_setup.py b/tests/unit/browser/test_browser_setup.py
index e8c9d056..fd721136 100644
--- a/tests/unit/browser/test_browser_setup.py
+++ b/tests/unit/browser/test_browser_setup.py
@@ -150,7 +150,8 @@ def test_temp_scope_token_uses_username_when_getuid_missing(
     from octop.infra.browser import setup as browser_setup
 
     # Simulate Windows: getuid absent / not callable.
-    monkeypatch.setattr(browser_setup.os, "getuid", object())
+    # raising=False: Windows os has no getuid (frozen module AttributeError otherwise).
+    monkeypatch.setattr(browser_setup.os, "getuid", object(), raising=False)
     monkeypatch.setenv("USERNAME", "OctopUser")
     monkeypatch.delenv("USER", raising=False)