diff --git a/tests/unit/integration_support/test_conformance.py b/tests/unit/integration_support/test_conformance.py
index 3dfa171a610..8f0acda74ca 100644
--- a/tests/unit/integration_support/test_conformance.py
+++ b/tests/unit/integration_support/test_conformance.py
@@ -14,6 +14,7 @@ from pydantic import ValidationError
 def test_owned_proxy_isolates_automatic_coverage_unless_requested(
     tmp_path: Path, monkeypatch: pytest.MonkeyPatch, explicit: bool
 ) -> None:
+    monkeypatch.syspath_prepend(str(Path(__file__).resolve().parents[2]))
     from integration._support.client import Gateway
     from integration._support.process import owned_proxy_process