diff --git a/MdePkg/Include/Guid/Cper.h b/MdePkg/Include/Guid/Cper.h
index 5ddd4c715e..f4f9885d90 100644
--- a/MdePkg/Include/Guid/Cper.h
+++ b/MdePkg/Include/Guid/Cper.h
@@ -256,6 +256,7 @@ typedef struct {
 ///@{
 #define EFI_GENERIC_ERROR_PROC_TYPE_IA32_X64         0x00
 #define EFI_GENERIC_ERROR_PROC_TYPE_IA64             0x01
+#define EFI_GENERIC_ERROR_PROC_TYPE_ARM              0x02
 ///@}
 
 ///
@@ -265,6 +266,8 @@ typedef struct {
 #define EFI_GENERIC_ERROR_PROC_ISA_IA32              0x00
 #define EFI_GENERIC_ERROR_PROC_ISA_IA64              0x01
 #define EFI_GENERIC_ERROR_PROC_ISA_X64               0x02
+#define EFI_GENERIC_ERROR_PROC_ISA_ARM_A32_T32       0x03
+#define EFI_GENERIC_ERROR_PROC_ISA_ARM_A64           0x04
 ///@}
 
 ///