diff --git a/noxfile.py b/noxfile.py
index 7c79a6de..416d959b 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -157,7 +157,6 @@ def typeguard(session: Session) -> None:
     session.install(".")
     session.install("pytest", "typeguard", "pygments")
     session.env["RUN_TYPEGUARD"] = "true"
-    session.env["TEST_DATABASE_TYPE"] = session.env.get("TEST_DATABASE_TYPE")
     session.run("pytest", *session.posargs)