1 files changed, 3 insertions, 3 deletions
diff --git a/MdePkg/Include/IndustryStandard/Acpi51.h b/MdePkg/Include/IndustryStandard/Acpi51.h
index fc28ffa18f..5fbf7c99f1 100644
--- a/MdePkg/Include/IndustryStandard/Acpi51.h
+++ b/MdePkg/Include/IndustryStandard/Acpi51.h
@@ -951,9 +951,9 @@ typedef struct {
 ///
 /// Memory Aggregator Device Type
 ///
-#define EFI_ACPI_5_1_PMMT_MEMORY_AGGREGATOR_DEVICE_TYPE_SOCKET            0x1
-#define EFI_ACPI_5_1_PMMT_MEMORY_AGGREGATOR_DEVICE_TYPE_MEMORY_CONTROLLER 0x2
-#define EFI_ACPI_5_1_PMMT_MEMORY_AGGREGATOR_DEVICE_TYPE_DIMM              0x3
+#define EFI_ACPI_5_1_PMMT_MEMORY_AGGREGATOR_DEVICE_TYPE_SOCKET            0x0
+#define EFI_ACPI_5_1_PMMT_MEMORY_AGGREGATOR_DEVICE_TYPE_MEMORY_CONTROLLER 0x1
+#define EFI_ACPI_5_1_PMMT_MEMORY_AGGREGATOR_DEVICE_TYPE_DIMM              0x2
 
 ///
 /// Socket Memory Aggregator Device Structure.