diff --git a/man3/updwtmp.3 b/man3/updwtmp.3
index bf60d484f..39b502d3c 100644
--- a/man3/updwtmp.3
+++ b/man3/updwtmp.3
@@ -75,7 +75,7 @@ T}	Thread safety	MT-Unsafe sig:ALRM timer
 .TE
 
 .SH CONFORMING TO
-Not in POSIX.1-2001.
+Not in POSIX.1.
 Present on Solaris, NetBSD, and perhaps other systems.
 .SH NOTES
 For consistency with the other "utmpx" functions (see