diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCmn600LibArm/SsdtCmn600Generator.c b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCmn600LibArm/SsdtCmn600Generator.c
index 97a5c55fa3..1e8c2bfca5 100644
--- a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCmn600LibArm/SsdtCmn600Generator.c
+++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtCmn600LibArm/SsdtCmn600Generator.c
@@ -1,7 +1,7 @@
 /** @file
   SSDT CMN-600 AML Table Generator.
 
-  Copyright (c) 2020, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2020 - 2021, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -511,7 +511,7 @@ BuildSsdtCmn600TableEx (
   UINT64                            Index;
   CM_ARM_CMN_600_INFO             * Cmn600Info;
   UINT32                            Cmn600Count;
-  CHAR8                             NewName[5];
+  CHAR8                             NewName[AML_NAME_SEG_SIZE + 1];
   EFI_ACPI_DESCRIPTION_HEADER    ** TableList;
 
   ASSERT (This != NULL);
diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtSerialPortLibArm/SsdtSerialPortGenerator.c b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtSerialPortLibArm/SsdtSerialPortGenerator.c
index 6a1e7487df..570f53aacf 100644
--- a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtSerialPortLibArm/SsdtSerialPortGenerator.c
+++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtSerialPortLibArm/SsdtSerialPortGenerator.c
@@ -1,7 +1,7 @@
 /** @file
   SSDT Serial Port Table Generator.
 
-  Copyright (c) 2020, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2020 - 2021, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
@@ -171,7 +171,7 @@ BuildSsdtSerialPortTableEx (
   CM_ARM_SERIAL_PORT_INFO       * SerialPortInfo;
   UINT32                          SerialPortCount;
   UINTN                           Index;
-  CHAR8                           NewName[5];
+  CHAR8                           NewName[AML_NAME_SEG_SIZE + 1];
   UINT64                          Uid;
   EFI_ACPI_DESCRIPTION_HEADER  ** TableList;
 
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/AmlDefines.h b/DynamicTablesPkg/Library/Common/AmlLib/AmlDefines.h
index cbae14d788..fff99e644b 100644
--- a/DynamicTablesPkg/Library/Common/AmlLib/AmlDefines.h
+++ b/DynamicTablesPkg/Library/Common/AmlLib/AmlDefines.h
@@ -1,7 +1,7 @@
 /** @file
   AML Defines.
 
-  Copyright (c) 2020, Arm Limited. All rights reserved.<BR>
+  Copyright (c) 2020 - 2021, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
@@ -138,13 +138,6 @@ typedef enum EAmlParseIndex {
 */
 #define AML_FIELD_NAMED_OP            0x04
 
-/** Size of a NameSeg.
-    Cf. ACPI 6.3 specification, s20.2.
-
-  @ingroup TreeStructures
-*/
- #define AML_NAME_SEG_SIZE            4U
-
 /** AML object types.
 
   The ACPI specification defines several object types. They are listed