diff --git a/configs/dcn/yolov3_enhance_reader.yml b/configs/dcn/yolov3_enhance_reader.yml
index 228e5558aa1c616021823aa7f99ac4748a1a9826..12d4179042746f7e72ac5ea2927d27a457f0e95f 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