diff --git a/sys/arch/x86/include/specialreg.h b/sys/arch/x86/include/specialreg.h
index f34e073cad1f..44ba3b870a7b 100644
--- a/sys/arch/x86/include/specialreg.h
+++ b/sys/arch/x86/include/specialreg.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: specialreg.h,v 1.17 2007/07/03 17:07:55 christos Exp $	*/
+/*	$NetBSD: specialreg.h,v 1.18 2007/07/11 11:56:36 njoly Exp $	*/
 
 /*-
  * Copyright (c) 1991 The Regents of the University of California.
@@ -146,13 +146,14 @@
 #define CPUID_MPC	0x00080000	/* Multiprocessing Capable */
 #define CPUID_NOX	0x00100000	/* No Execute Page Protection */
 #define CPUID_MMXX	0x00400000	/* AMD MMX Extensions */
+#define CPUID_RDTSCP	0x08000000	/* Read TSC Pair Instruction */
 #define CPUID_3DNOW2	0x40000000	/* 3DNow! Instruction Extension */
 #define CPUID_3DNOW	0x80000000	/* 3DNow! Instructions */
 
 #define CPUID_EXT_FLAGS2	"\20\16PGE\17MCA\20CMOV\21PAT\22PSE36\23PN" \
 				    "\24MPC\25NOX\26B21\27MMXX\30MMX"
-#define CPUID_EXT_FLAGS3	"\20\31FXSR\32SSE\33SSE2\34B27\35HTT\36LONG" \
-				    "\0373DNOW2\0403DNOW"
+#define CPUID_EXT_FLAGS3	"\20\31FXSR\32SSE\33SSE2\34RDTSCP\35HTT" \
+				    "\36LONG\0373DNOW2\0403DNOW"
 
 /*
  * Centaur Extended Feature flags