diff --git a/thrust/thrust/system/cuda/detail/scan.h b/thrust/thrust/system/cuda/detail/scan.h
index e225f2cfe4e..e2530691db7 100644
--- a/thrust/thrust/system/cuda/detail/scan.h
+++ b/thrust/thrust/system/cuda/detail/scan.h
@@ -63,8 +63,8 @@ _CCCL_HOST_DEVICE OutputIt inclusive_scan_n_impl(
   thrust::cuda_cub::execution_policy<Derived>& policy, InputIt first, Size num_items, OutputIt result, ScanOp scan_op)
 {
   using AccumT     = typename thrust::iterator_traits<InputIt>::value_type;
-  using Dispatch32 = cub::DispatchScan<InputIt, OutputIt, ScanOp, cub::NullType, std::int32_t, AccumT>;
-  using Dispatch64 = cub::DispatchScan<InputIt, OutputIt, ScanOp, cub::NullType, std::int64_t, AccumT>;
+  using Dispatch32 = cub::DispatchScan<InputIt, OutputIt, ScanOp, cub::NullType, std::uint32_t, AccumT>;
+  using Dispatch64 = cub::DispatchScan<InputIt, OutputIt, ScanOp, cub::NullType, std::uint64_t, AccumT>;
 
   cudaStream_t stream = thrust::cuda_cub::stream(policy);
   cudaError_t status;
@@ -113,8 +113,8 @@ _CCCL_HOST_DEVICE OutputIt exclusive_scan_n_impl(
   ScanOp scan_op)
 {
   using InputValueT = cub::detail::InputValue<InitValueT>;
-  using Dispatch32  = cub::DispatchScan<InputIt, OutputIt, ScanOp, InputValueT, std::int32_t, InitValueT>;
-  using Dispatch64  = cub::DispatchScan<InputIt, OutputIt, ScanOp, InputValueT, std::int64_t, InitValueT>;
+  using Dispatch32  = cub::DispatchScan<InputIt, OutputIt, ScanOp, InputValueT, std::uint32_t, InitValueT>;
+  using Dispatch64  = cub::DispatchScan<InputIt, OutputIt, ScanOp, InputValueT, std::uint64_t, InitValueT>;
 
   cudaStream_t stream = thrust::cuda_cub::stream(policy);
   cudaError_t status;