1 files changed, 3 insertions, 3 deletions
diff --git a/MdePkg/Include/IndustryStandard/Acpi64.h b/MdePkg/Include/IndustryStandard/Acpi64.h
index 3a91302f8c..8346d83f12 100644
--- a/MdePkg/Include/IndustryStandard/Acpi64.h
+++ b/MdePkg/Include/IndustryStandard/Acpi64.h
@@ -1075,9 +1075,9 @@ typedef struct {
 ///
 /// Memory Device Type.
 ///
-#define EFI_ACPI_6_4_PMTT_MEMORY_DEVICE_TYPE_SOCKET               0x1
-#define EFI_ACPI_6_4_PMTT_MEMORY_DEVICE_TYPE_MEMORY_CONTROLLER    0x2
-#define EFI_ACPI_6_4_PMTT_MEMORY_DEVICE_TYPE_DIMM                 0x3
+#define EFI_ACPI_6_4_PMTT_MEMORY_DEVICE_TYPE_SOCKET               0x0
+#define EFI_ACPI_6_4_PMTT_MEMORY_DEVICE_TYPE_MEMORY_CONTROLLER    0x1
+#define EFI_ACPI_6_4_PMTT_MEMORY_DEVICE_TYPE_DIMM                 0x2
 #define EFI_ACPI_6_4_PMTT_MEMORY_DEVICE_TYPE_VENDOR_SPECIFIC_TYPE 0xFF
 
 ///