diff --git a/torchao/csrc/cpu/aten_kernels/float8_linear.cpp b/torchao/csrc/cpu/aten_kernels/float8_linear.cpp
index e9b290771d..fb40f088a6 100644
--- a/torchao/csrc/cpu/aten_kernels/float8_linear.cpp
+++ b/torchao/csrc/cpu/aten_kernels/float8_linear.cpp
@@ -453,7 +453,11 @@ void _float8_linear_impl(
   TORCH_CHECK(weight.size(3) == block_n, "Float8 linear: unexpected weight shape");
   int64_t N = Nc * block_n;
   TORCH_CHECK(K == Kc * block_k, "Float8 linear: weight and input shapes mismatch");
-  auto [parallel_on_M, block_m, Mc, Mc_parallel] = get_m_blocking(M);
+  std::tuple<bool, int64_t, int64_t, int64_t> m_blocking_info = get_m_blocking(M);
+  bool parallel_on_M = std::get<0>(m_blocking_info);
+  int64_t block_m = std::get<1>(m_blocking_info);
+  int64_t Mc = std::get<2>(m_blocking_info);
+  int64_t Mc_parallel = std::get<3>(m_blocking_info);
   int64_t num_parallel_blocks = Mc_parallel * Nc;
 
   // scales shape = [Nc, G, block_n]