diff --git a/reactos/include/defines.h b/reactos/include/defines.h
index 3761890e9ca..ef24bf6cb24 100644
--- a/reactos/include/defines.h
+++ b/reactos/include/defines.h
@@ -4106,10 +4106,21 @@ extern "C" {
 #define SORT_KOREAN_UNICODE	(1)
 
 /* SYSTEM_INFO structure */
+#define PROCESSOR_ARCHITECTURE_IA64 (6)
+#define PROCESSOR_ARCHITECTURE_AMD64 (9)
+#define PROCESSOR_ARCHITECTURE_IA64_ON_WIN64 (10)
 #define PROCESSOR_INTEL_386	(386)
 #define PROCESSOR_INTEL_486	(486)
 #define PROCESSOR_INTEL_PENTIUM	(586)
+#define PROCESSOR_INTEL_PENTIUMII (686)
+#define PROCESSOR_INTEL_PENTIUMIII (786)
+#define PROCESSOR_PPC_601	(601)
+#define PROCESSOR_PPC_603	(603)
+#define PROCESSOR_PPC_604	(604)
+#define PROCESSOR_PPC_620	(620)
+#define PROCESSOR_INTEL_IA64	(2200)
 #define PROCESSOR_MIPS_R4000	(4000)
+#define PROCESSOR_AMD_X8664	(8664)
 #define PROCESSOR_ALPHA_21064	(21064)
 
 /* TAPE_GET_DRIVE_PARAMETERS structure */