diff --git a/a38/traversal.py b/a38/traversal.py
index 0c9d9e3..b465925 100644
--- a/a38/traversal.py
+++ b/a38/traversal.py
@@ -1,7 +1,8 @@
 from contextlib import contextmanager
-from typing import Optional
+from typing import TYPE_CHECKING, Optional
 
-from . import fields
+if TYPE_CHECKING:
+    from . import fields
 
 
 class Annotation: