diff --git a/thrust/thrust/system/cuda/detail/util.h b/thrust/thrust/system/cuda/detail/util.h
index 7185ddb8d7e..b5a7125e61b 100644
--- a/thrust/thrust/system/cuda/detail/util.h
+++ b/thrust/thrust/system/cuda/detail/util.h
@@ -174,7 +174,7 @@ trivial_copy_device_to_device(Policy& policy, Type* dst, Type const* src, size_t
   cudaStream_t stream = cuda_cub::stream(policy);
   //
   status = ::cudaMemcpyAsync(dst, src, sizeof(Type) * count, cudaMemcpyDeviceToDevice, stream);
-  cuda_cub::synchronize(policy);
+  cuda_cub::synchronize_optional(policy);
   return status;
 }