diff --git a/share/man/man3/stdckdint.3 b/share/man/man3/stdckdint.3
index e3593472c08..4f12b4a8c57 100644
--- a/share/man/man3/stdckdint.3
+++ b/share/man/man3/stdckdint.3
@@ -87,7 +87,7 @@ int main(void)
 .\" and
 .\" .Nm ckd_mul
 .\" macros conform to
-.\" .St -isoC-23 .
+.\" .St -isoC-2023 .
 .Sh HISTORY
 The
 .Nm ckd_add ,