diff --git a/vendor/golang.org/x/sys/unix/syscall_openbsd_arm.go b/vendor/golang.org/x/sys/unix/syscall_openbsd_arm.go
index 5d812aa..1c3d26f 100644
--- a/vendor/golang.org/x/sys/unix/syscall_openbsd_arm.go
+++ b/vendor/golang.org/x/sys/unix/syscall_openbsd_arm.go
@@ -28,6 +28,10 @@
 	msghdr.Controllen = uint32(length)
 }
 
+func (msghdr *Msghdr) SetIovlen(length int) {
+	msghdr.Iovlen = uint32(length)
+}
+
 func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint32(length)
 }