diff --git a/libpldmresponder/file_io.cpp b/libpldmresponder/file_io.cpp
index 06d683b..1ebedfd 100644
--- a/libpldmresponder/file_io.cpp
+++ b/libpldmresponder/file_io.cpp
@@ -30,13 +30,13 @@
  */
 struct AspeedXdmaOp
 {
-    uint8_t upstream;  //!< boolean indicating the direction of the DMA
-                       //!< operation, true means a transfer from BMC to host.
     uint64_t hostAddr; //!< the DMA address on the host side, configured by
                        //!< PCI subsystem.
     uint32_t len;      //!< the size of the transfer in bytes, it should be a
                        //!< multiple of 16 bytes
-} __attribute__((packed));
+    uint32_t upstream; //!< boolean indicating the direction of the DMA
+                       //!< operation, true means a transfer from BMC to host.
+};
 
 constexpr auto xdmaDev = "/dev/xdma";