diff --git a/ttnn/cpp/ttnn/operations/matmul/device/matmul_op.hpp b/ttnn/cpp/ttnn/operations/matmul/device/matmul_op.hpp
index b8e6aa1a09ea..fc5a6634d2c2 100644
--- a/ttnn/cpp/ttnn/operations/matmul/device/matmul_op.hpp
+++ b/ttnn/cpp/ttnn/operations/matmul/device/matmul_op.hpp
@@ -216,7 +216,7 @@ Tensor matmul(
     const std::optional<const Tensor> bias = std::nullopt,
     const struct Matmul &parameters = Matmul{},
     const uint8_t queue_id = 0,
-    std::optional<Tensor> optional_output_tensor = std::nullopt);
+    const std::optional<Tensor> optional_output_tensor = std::nullopt);
 }  // namespace matmul
 
 }  // namespace operations