diff --git a/api/onnx_web/image.py b/api/onnx_web/image.py
index 292572e81..2d9cdb3b5 100644
--- a/api/onnx_web/image.py
+++ b/api/onnx_web/image.py
@@ -146,7 +146,7 @@ def expand_image(
         expand_by: Tuple[int, int, int, int],
         fill='white',
         noise_source=noise_source_histogram,
-        mask_filter=mask_filter_gaussian,
+        mask_filter=mask_filter_none,
 ):
     left, right, top, bottom = expand_by