diff --git a/esbo_etc/classes/SpectralQty.py b/esbo_etc/classes/SpectralQty.py
index bc0549e..4bc42e2 100644
--- a/esbo_etc/classes/SpectralQty.py
+++ b/esbo_etc/classes/SpectralQty.py
@@ -2,7 +2,6 @@ from ..lib.helpers import isLambda, readCSV
 from ..lib.logger import logger
 from scipy.interpolate import interp1d
 import astropy.units as u
-import math
 from typing import Union, Callable
 import os
 from scipy.integrate import trapz