diff --git a/configs/pascal_voc/ssd512_voc0712.py b/configs/pascal_voc/ssd512_voc0712.py
index ea2b69f33cb..30bf79192e3 100644
--- a/configs/pascal_voc/ssd512_voc0712.py
+++ b/configs/pascal_voc/ssd512_voc0712.py
@@ -1,6 +1,11 @@
 _base_ = 'ssd300_voc0712.py'
 input_size = 512
 model = dict(
+    neck=dict(
+        out_channels=(512, 1024, 512, 256, 256, 256, 256),
+        level_strides=(2, 2, 2, 2, 1),
+        level_paddings=(1, 1, 1, 1, 1),
+        last_kernel_size=4),
     bbox_head=dict(
         in_channels=(512, 1024, 512, 256, 256, 256, 256),
         anchor_generator=dict(