diff --git a/pytorch3d/csrc/pulsar/pytorch/renderer.cpp b/pytorch3d/csrc/pulsar/pytorch/renderer.cpp
index aa53192c..4349aea7 100644
--- a/pytorch3d/csrc/pulsar/pytorch/renderer.cpp
+++ b/pytorch3d/csrc/pulsar/pytorch/renderer.cpp
@@ -213,8 +213,8 @@ std::tuple<size_t, size_t, bool, torch::Tensor> Renderer::arg_check(
     const float& gamma,
     const float& max_depth,
     float& min_depth,
-    const std::optional<torch::Tensor>& bg_col,
-    const std::optional<torch::Tensor>& opacity,
+    const c10::optional<torch::Tensor>& bg_col,
+    const c10::optional<torch::Tensor>& opacity,
     const float& percent_allowed_difference,
     const uint& max_n_hits,
     const uint& mode) {
@@ -668,8 +668,8 @@ std::tuple<torch::Tensor, torch::Tensor> Renderer::forward(
     const float& gamma,
     const float& max_depth,
     float min_depth,
-    const std::optional<torch::Tensor>& bg_col,
-    const std::optional<torch::Tensor>& opacity,
+    const c10::optional<torch::Tensor>& bg_col,
+    const c10::optional<torch::Tensor>& opacity,
     const float& percent_allowed_difference,
     const uint& max_n_hits,
     const uint& mode) {
@@ -912,8 +912,8 @@ Renderer::backward(
     const float& gamma,
     const float& max_depth,
     float min_depth,
-    const std::optional<torch::Tensor>& bg_col,
-    const std::optional<torch::Tensor>& opacity,
+    const c10::optional<torch::Tensor>& bg_col,
+    const c10::optional<torch::Tensor>& opacity,
     const float& percent_allowed_difference,
     const uint& max_n_hits,
     const uint& mode,
diff --git a/pytorch3d/csrc/pulsar/pytorch/renderer.h b/pytorch3d/csrc/pulsar/pytorch/renderer.h
index 33f9e24f..2525ca3f 100644
--- a/pytorch3d/csrc/pulsar/pytorch/renderer.h
+++ b/pytorch3d/csrc/pulsar/pytorch/renderer.h
@@ -44,8 +44,8 @@ struct Renderer {
       const float& gamma,
       const float& max_depth,
       float min_depth,
-      const std::optional<torch::Tensor>& bg_col,
-      const std::optional<torch::Tensor>& opacity,
+      const c10::optional<torch::Tensor>& bg_col,
+      const c10::optional<torch::Tensor>& opacity,
       const float& percent_allowed_difference,
       const uint& max_n_hits,
       const uint& mode);
@@ -75,8 +75,8 @@ struct Renderer {
       const float& gamma,
       const float& max_depth,
       float min_depth,
-      const std::optional<torch::Tensor>& bg_col,
-      const std::optional<torch::Tensor>& opacity,
+      const c10::optional<torch::Tensor>& bg_col,
+      const c10::optional<torch::Tensor>& opacity,
       const float& percent_allowed_difference,
       const uint& max_n_hits,
       const uint& mode,
@@ -115,8 +115,8 @@ struct Renderer {
       const float& gamma,
       const float& max_depth,
       float& min_depth,
-      const std::optional<torch::Tensor>& bg_col,
-      const std::optional<torch::Tensor>& opacity,
+      const c10::optional<torch::Tensor>& bg_col,
+      const c10::optional<torch::Tensor>& opacity,
       const float& percent_allowed_difference,
       const uint& max_n_hits,
       const uint& mode);