diff --git a/configs/dcn/yolov3_enhance_reader.yml b/configs/dcn/yolov3_enhance_reader.yml
index 6616d6b2a0d7927da9074cbc59eaac4412b44971..0cb379d2542587d04fee3cd68d42adf22ec18031 100644
--- a/configs/dcn/yolov3_enhance_reader.yml
+++ b/configs/dcn/yolov3_enhance_reader.yml
@@ -70,6 +70,8 @@ EvalReader:
       std: [0.229, 0.224, 0.225]
       is_scale: False
       is_channel_first: false
+    - !PadBox
+      num_max_boxes: 50
     - !Permute
       to_bgr: false
       channel_first: True