diff --git a/ultralytics/nn/modules/head.py b/ultralytics/nn/modules/head.py
index 7b04f87f..e7c36ba2 100644
--- a/ultralytics/nn/modules/head.py
+++ b/ultralytics/nn/modules/head.py
@@ -303,7 +303,7 @@ class RTDETRDecoder(nn.Module):
             grid_y, grid_x = torch.meshgrid(sy, sx, indexing='ij') if TORCH_1_10 else torch.meshgrid(sy, sx)
             grid_xy = torch.stack([grid_x, grid_y], -1)  # (h, w, 2)
 
-            valid_WH = torch.tensor([h, w], dtype=dtype, device=device)
+            valid_WH = torch.tensor([w, h], dtype=dtype, device=device)
             grid_xy = (grid_xy.unsqueeze(0) + 0.5) / valid_WH  # (1, h, w, 2)
             wh = torch.ones_like(grid_xy, dtype=dtype, device=device) * grid_size * (2.0 ** i)
             anchors.append(torch.cat([grid_xy, wh], -1).view(-1, h * w, 4))  # (1, h*w, 4)