diff --git a/rembg/sessions/u2net_custom.py b/rembg/sessions/u2net_custom.py
index de6346fc..2350a8ed 100644
--- a/rembg/sessions/u2net_custom.py
+++ b/rembg/sessions/u2net_custom.py
@@ -2,6 +2,7 @@
 from typing import List
 
 import numpy as np
+import onnxruntime as ort
 import pooch
 from PIL import Image
 from PIL.Image import Image as PILImage