diff --git a/src/nmreval/math/logfourier.py b/src/nmreval/math/logfourier.py
index e150b05..ffc88fd 100644
--- a/src/nmreval/math/logfourier.py
+++ b/src/nmreval/math/logfourier.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import numpy as np
 
 __doc__ = r"""