diff --git a/configs/yolov7/yolov7_l_syncbn_fast_8x16b-300e_coco.py b/configs/yolov7/yolov7_l_syncbn_fast_8x16b-300e_coco.py
index 5c4e5141..659f3a0f 100644
--- a/configs/yolov7/yolov7_l_syncbn_fast_8x16b-300e_coco.py
+++ b/configs/yolov7/yolov7_l_syncbn_fast_8x16b-300e_coco.py
@@ -67,7 +67,7 @@ model = dict(
         type='YOLOv7Head',
         head_module=dict(
             type='YOLOv7HeadModule',
-            num_classes=80,
+            num_classes=num_classes,
             in_channels=[256, 512, 1024],
             featmap_strides=strides,
             num_base_priors=3),