diff --git a/tests/test_superresolution.py b/tests/test_superresolution.py
index 12304f492ae1ad5bf78efebfba63d46fece3c197..4df914acd0b552a425d2a046091a46cc92d229da 100644
--- a/tests/test_superresolution.py
+++ b/tests/test_superresolution.py
@@ -8,7 +8,6 @@
 
 """
 from os.path import dirname, join
-from time import sleep
 
 import numpy as np
 import skimage.io