diff --git a/include/elf/common.h b/include/elf/common.h
index 69ea572b2..c1b62746f 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -242,6 +242,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #define NT_FPREGSET	2		/* Contains copy of fpregset struct */
 #define NT_PRPSINFO	3		/* Contains copy of prpsinfo struct */
 #define NT_TASKSTRUCT	4		/* Contains copy of task struct */
+#define NT_PRXFPREG     0x46e62b7f	/* Contains a user_xfpregs_struct;
+					   note name must be "LINUX".  */
 
 /* Note segments for core files on dir-style procfs systems. */