diff --git a/tests/test_declarations.py b/tests/test_declarations.py
index 59fc687639..49928ba3b2 100644
--- a/tests/test_declarations.py
+++ b/tests/test_declarations.py
@@ -380,7 +380,7 @@ def pwrite(fd: int, data: bytes, offset: int) -> int:
             comms.registry.register(Thread(name='b', tags=frozenset(), worktree='/wt'))
         monkeypatch.undo()
         with pytest.raises(RelationViolationError):
-            Registration(root / "registry.json")
+            Registration(root / "registry.json").require("a")
 
     @pytest.mark.skipif(os.name == "nt", reason="private POSIX ownership unavailable on Windows")
     @pytest.mark.parametrize("damage", ["missing", "corrupt", "truncated", "strip_epochs"])
diff --git a/tests/test_turn_record.py b/tests/test_turn_record.py
index 23b1d99a18..ca96626fa8 100644
--- a/tests/test_turn_record.py
+++ b/tests/test_turn_record.py
@@ -36,7 +36,8 @@ def test_copied_registry_resolves_turn_from_its_new_location(tmp_path):
 
     forged = json.loads((copied / 'registry.json').read_text())
     forged['threads']['worker']['turn_record']['lookup'] = 'wrong-identity'
+    (copied / 'registry.json').write_text(json.dumps(forged))
     with pytest.raises(RelationViolationError):
-        moved._decode(forged)
+        RegistryStore(copied / 'registry.json').read_entry('worker')