diff --git a/tests/conftest.py b/tests/conftest.py
index 0acab459..6679cbe7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -145,3 +145,8 @@ def ref_axes(request):
 def seeds():
     """1000 unique seeds for ensemble runs that need an RNG seed."""
     return _io.read_scsv(_io.data("rng") / "seeds.scsv").seeds
+
+@pytest.fixture
+def seed():
+    """Default seed for test RNG."""
+    return 8816