diff --git a/lib/libc/string/wmemchr.3 b/lib/libc/string/wmemchr.3
index 63259fa1e80..ff82e73a356 100644
--- a/lib/libc/string/wmemchr.3
+++ b/lib/libc/string/wmemchr.3
@@ -137,11 +137,7 @@ counterpart, such as
 .Xr strstr 3
 .Sh STANDARDS
 These functions conform to
-.\" .St -isoC99
-ISO/IEC 9899:1999 (``ISO C99'')
-and were first introduced in
-.\" .St -isoC-amd1 ,
-ISO/IEC 9899/AMD1:1995 (``ISO C90'')
+.St -isoC-99 ,
 with the exception of
 .Fn wcslcat
 and