diff --git a/SDK/INC/NT/ntdef.h b/SDK/INC/NT/ntdef.h
index 25e70c8..0983d13 100644
--- a/SDK/INC/NT/ntdef.h
+++ b/SDK/INC/NT/ntdef.h
@@ -117,6 +117,15 @@ typedef ULONGLONG *PULONGLONG;
 #define MAXLONGLONG  0x7fffffffffffffff
 #define MAXULONGLONG 0xffffffffffffffff
 
+#define LODWORD(x) ((ULONG)(x))
+#define HIDWORD(x) ((ULONG)((x) >> 32))
+
+#define LOWORD(x) ((USHORT)(x))
+#define HIWORD(x) ((USHORT)((x) >> 16))
+
+#define LOBYTE(x) ((UCHAR)(x))
+#define HIBYTE(x) ((UCHAR)((x) >> 8))
+
 //
 // Logical/boolean value types.
 //