diff --git a/tests/test_identity_gate.py b/tests/test_identity_gate.py
index 3f8f10d4..3791fa7d 100644
--- a/tests/test_identity_gate.py
+++ b/tests/test_identity_gate.py
@@ -87,7 +87,7 @@ class TestIdentityScore:
             assert isinstance(axis_id, str)
 
     def test_legacy_constructor_emits_deprecation_warning(self):
-        with pytest.deprecated_call(match="IdentityCheck\(manifold=\.\.\.\) is deprecated"):
+        with pytest.deprecated_call(match=r"IdentityCheck\(manifold=\.\.\.\) is deprecated"):
             check = IdentityCheck(manifold=_make_manifold())
         score = check.check(_make_trajectory())
         assert isinstance(score, IdentityScore)