diff --git a/tools/infer/predict_det.py b/tools/infer/predict_det.py
index 8abe006460e858b7d599630b556911aa25de24c5..73387aef597716809c02657404456660734c4c7b 100755
--- a/tools/infer/predict_det.py
+++ b/tools/infer/predict_det.py
@@ -24,6 +24,7 @@ import cv2
 import numpy as np
 import time
 import sys
+from scipy.spatial import distance as dist
 
 import tools.infer.utility as utility
 from ppocr.utils.logging import get_logger