diff --git a/pytest_asyncio/plugin.py b/pytest_asyncio/plugin.py
index 38b75e41..e99a8d03 100644
--- a/pytest_asyncio/plugin.py
+++ b/pytest_asyncio/plugin.py
@@ -979,8 +979,7 @@ def _parse_asyncio_marker(
     scope = asyncio_marker.kwargs.get("loop_scope") or asyncio_marker.kwargs.get(
         "scope"
     )
-    if scope is not None:
-        assert scope in {"function", "class", "module", "package", "session"}
+    _validate_scope(scope, "loop_scope")
     marker_value = asyncio_marker.kwargs.get("loop_factories")
     if marker_value is None:
         return scope, None