diff --git a/src/tests/unit/cpu/test_waveforms.py b/src/tests/unit/cpu/test_waveforms.py
index 68a7b1b..7c4a608 100644
--- a/src/tests/unit/cpu/test_waveforms.py
+++ b/src/tests/unit/cpu/test_waveforms.py
@@ -11,6 +11,7 @@
 import unittest
 
 
+
 def make_array_peak_through_tip():
     arr = np. array([[[1, 1, np.nan],
                       [2, 2, np.nan],