diff --git a/tests/test_image_encoder.py b/tests/test_image_encoder.py
index 23da2760..842e3e01 100644
--- a/tests/test_image_encoder.py
+++ b/tests/test_image_encoder.py
@@ -5,7 +5,7 @@
 import numpy as np
 
 from gnes.encoder.image.base import BasePytorchEncoder
-from gnes.preprocessor.image.slidingWindow import VanillaSlidingPreprocessor
+from gnes.preprocessor.image.sliding_window import VanillaSlidingPreprocessor
 from gnes.preprocessor.base import BaseSingletonPreprocessor
 from gnes.proto import gnes_pb2, blob2array