diff --git a/vendor/golang.org/x/sys/unix/syscall_openbsd_amd64.go b/vendor/golang.org/x/sys/unix/syscall_openbsd_amd64.go
index 9a35334..bab2536 100644
--- a/vendor/golang.org/x/sys/unix/syscall_openbsd_amd64.go
+++ b/vendor/golang.org/x/sys/unix/syscall_openbsd_amd64.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build amd64 && openbsd
 // +build amd64,openbsd
 
 package unix
@@ -28,6 +29,10 @@
 	msghdr.Controllen = uint32(length)
 }
 
+func (msghdr *Msghdr) SetIovlen(length int) {
+	msghdr.Iovlen = uint32(length)
+}
+
 func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint32(length)
 }