diff --git a/pcie_i2c.hpp b/pcie_i2c.hpp
index 5f1cd35..63d4df8 100644
--- a/pcie_i2c.hpp
+++ b/pcie_i2c.hpp
@@ -19,7 +19,7 @@
 #include <ipmid/api.h>
 
 #include <ipmid/api-types.hpp>
-#include <vector>
+#include <span>
 
 namespace google
 {
@@ -39,12 +39,11 @@
 
 //  Handle the pcie slot count command.
 //  Sys can query the number of pcie slots.
-Resp pcieSlotCount(const std::vector<std::uint8_t>& data,
-                   HandlerInterface* handler);
+Resp pcieSlotCount(std::span<const uint8_t> data, HandlerInterface* handler);
 
 // Handle the pcie slot to i2c bus mapping command.
 // Sys can query which i2c bus is routed to which pcie slot.
-Resp pcieSlotI2cBusMapping(const std::vector<std::uint8_t>& data,
+Resp pcieSlotI2cBusMapping(std::span<const uint8_t> data,
                            HandlerInterface* handler);
 
 } // namespace ipmi