diff --git a/MdePkg/Include/Common/BootScript.h b/MdePkg/Include/Common/BootScript.h
index 59d71c1f79..8e2ddb9d1a 100644
--- a/MdePkg/Include/Common/BootScript.h
+++ b/MdePkg/Include/Common/BootScript.h
@@ -40,6 +40,8 @@
 #define EFI_BOOT_SCRIPT_TABLE_OPCODE                  0xAA
 #define EFI_BOOT_SCRIPT_TERMINATE_OPCODE              0xFF
 
+#pragma pack(1)
+
 //
 // EFI Boot Script Width
 //
@@ -204,4 +206,6 @@ typedef union {
   UINT8                                 *Raw;
 } BOOT_SCRIPT_POINTERS;
 
+#pragma pack()
+
 #endif