diff --git a/pytorch3d/csrc/pulsar/pytorch/renderer.cpp b/pytorch3d/csrc/pulsar/pytorch/renderer.cpp
index 635dee41..f57a1d49 100644
--- a/pytorch3d/csrc/pulsar/pytorch/renderer.cpp
+++ b/pytorch3d/csrc/pulsar/pytorch/renderer.cpp
@@ -1046,7 +1046,7 @@ Renderer::backward(
       at::optional<torch::Tensor>,
       at::optional<torch::Tensor>>
       ret;
-  if (mode == 1 || (!dif_pos && !dif_col && !dif_rad && !dif_cam)) {
+  if (mode == 1 || (!dif_pos && !dif_col && !dif_rad && !dif_cam && !dif_opy)) {
     return ret;
   }
   // Create the camera information.