diff --git a/include/winternl.h b/include/winternl.h
index bcf18f57920..79078f0bf9d 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -1146,8 +1146,7 @@ typedef struct _SYSTEM_CPU_INFORMATION {
 #define CPU_FEATURE_FXSR   0x00000800   /* FXSAVE and FXSTORE instructions */
 #define CPU_FEATURE_SEP    0x00001000   /* SYSENTER and SYSEXIT instructions */
 #define CPU_FEATURE_SSE    0x00002000   /* SSE extensions (ext. MMX) */
-#define CPU_FEATURE_3DNOW  0x00008000   /* 3DNOW instructions available 
-                                           (FIXME: needs to be confirmed) */
+#define CPU_FEATURE_3DNOW  0x00004000   /* 3DNOW instructions available */
 #define CPU_FEATURE_SSE2   0x00010000   /* SSE2 extensions (XMMI64) */
 #define CPU_FEATURE_DS     0x00020000   /* Debug Store */
 #define CPU_FEATURE_HTT    0x00040000   /* Hyper Threading Technology */