diff --git a/wetb/signal/tests/test_interpolation.py b/wetb/signal/tests/test_interpolation.py
index 3482829ecc39c382509a31bee97c3db2f84d11b6..6fb71e8131a5d0f3765d25c154fd3910c2e410ca 100644
--- a/wetb/signal/tests/test_interpolation.py
+++ b/wetb/signal/tests/test_interpolation.py
@@ -8,7 +8,6 @@ import unittest
 from matplotlib.pyplot  import *
 import numpy as np
 from wetb import signal
-from wetb.signal.time_shift import find_time_shift
 from wetb import gtsdf
 import os
 from wetb.gtsdf.unix_time import from_unix