diff --git a/include/winnt.h b/include/winnt.h
index 04f6dfd5c77..e6f9b3ce270 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -556,6 +556,7 @@ typedef DWORD FLONG;
 #define PROCESSOR_ARM820         2080    /* 0x820 */
 #define PROCESSOR_ARM920         2336    /* 0x920 */
 #define PROCESSOR_ARM_7TDMI      70001
+#define PROCESSOR_OPTIL          18767
 
 #ifdef _WIN64
 #define MAXIMUM_PROCESSORS       64