diff --git a/sdk/xtdk/ketypes.h b/sdk/xtdk/ketypes.h
index 80fea0f..b1dc33b 100644
--- a/sdk/xtdk/ketypes.h
+++ b/sdk/xtdk/ketypes.h
@@ -384,7 +384,6 @@ typedef struct _EXCEPTION_RECORD
 /* Extended affinity structure definition */
 typedef struct _KAFFINITY_MAP
 {
-    USHORT Count;
     USHORT Size;
     ULONG Reserved;
     KAFFINITY Bitmap[];