diff --git a/MdePkg/Include/Guid/Cper.h b/MdePkg/Include/Guid/Cper.h
index 4a31d34399..a947301c05 100644
--- a/MdePkg/Include/Guid/Cper.h
+++ b/MdePkg/Include/Guid/Cper.h
@@ -262,6 +262,7 @@ 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
 ///@}
 
 ///