diff --git a/tests/conftest.py b/tests/conftest.py
index 80561c1..598457d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -19,10 +19,15 @@
 def default_env(monkeysession: pytest.MonkeyPatch, nice_tmpdir_ses: str) -> Generator[None, None, None]:
     """Setup some default environment variables"""
     datadir = Path(nice_tmpdir_ses) / "data"
+    cadir = datadir / "ca_public"
+    cadir.mkdir(parents=True, exist_ok=True)
+    crlfile = cadir / "crl.der"
     with monkeysession.context() as mpatch:
+        crlfile.write_text("DUMMY")
         mpatch.setenv("CI", "true")
         mpatch.setenv("OR_DATA_PATH", str(datadir))
         mpatch.setenv("OR_CFSSL", "fakessl")
+        mpatch.setenv("OR_CRL", str(crlfile))
         yield None