diff --git a/src/hr_selection_function/math.py b/src/hr_selection_function/math.py
index d820d1b..a9fe6e5 100644
--- a/src/hr_selection_function/math.py
+++ b/src/hr_selection_function/math.py
@@ -1,5 +1,4 @@
 import numpy as np
-from numpy.typing import ArrayLike
 from numba import njit