diff --git a/cpp/src/c_api/neighbor_sampling.cpp b/cpp/src/c_api/neighbor_sampling.cpp
index 5b05b54201..cc4c09ead2 100644
--- a/cpp/src/c_api/neighbor_sampling.cpp
+++ b/cpp/src/c_api/neighbor_sampling.cpp
@@ -875,19 +875,20 @@ struct neighbor_sampling_functor : public cugraph::c_api::abstract_functor {
           handle_.get_comms(), num_local_labels, handle_.get_stream());
 
         std::exclusive_scan(
-          global_labels.begin(), global_labels.end(), global_labels.begin(), size_t{0});
-
-        // Compute the global start_vertex_label_offsets
-        cugraph::detail::transform_increment(handle_.get_stream(),
-                                             start_vertex_offsets_->as_type<size_t>(),
-                                             start_vertex_offsets_->size_,
-                                             global_labels[handle_.get_comms().get_rank()]);
+          global_labels.begin(), global_labels.end(), global_labels.begin(), label_t{0});
 
         // Retrieve the start_vertex_labels
         start_vertex_labels = cugraph::detail::convert_starting_vertex_offsets_to_labels(
           handle_,
           raft::device_span<size_t const>{start_vertex_offsets_->as_type<size_t>(),
                                           start_vertex_offsets_->size_});
+
+        // Compute the global start_vertex_label_offsets
+        cugraph::detail::transform_increment(handle_.get_stream(),
+                                              (label_t*)(*start_vertex_labels).data(),
+                                              (size_t)(*start_vertex_labels).size(),
+                                              (label_t)global_labels[handle_.get_comms().get_rank()]
+                                              );
       }
 
       if constexpr (multi_gpu) {