diff --git a/mlx/backend/cuda/slicing.cpp b/mlx/backend/cuda/slicing.cpp
index af67fbbdd..64a2afe74 100644
--- a/mlx/backend/cuda/slicing.cpp
+++ b/mlx/backend/cuda/slicing.cpp
@@ -1,6 +1,7 @@
 // Copyright © 2025 Apple Inc.
 
 #include "mlx/backend/common/slicing.h"
+#include "mlx/backend/cuda/device.h"
 #include "mlx/backend/gpu/copy.h"
 #include "mlx/backend/gpu/slicing.h"
 
@@ -27,8 +28,7 @@ void concatenate_gpu(
   flags.row_contiguous = false;
   flags.col_contiguous = false;
   flags.contiguous = false;
-  // TODO: Handle concurrent outputs:
-  // https://github.com/ml-explore/mlx/pull/2145#discussion_r2070753816
+  auto concurrent = cu::get_command_encoder(s).concurrent_context();
   for (int i = 0; i < inputs.size(); i++) {
     array out_slice(inputs[i].shape(), out.dtype(), nullptr, {});
     size_t data_offset = strides[axis] * sizes[i];