diff --git a/unix/syscall_openbsd_mips64.go b/unix/syscall_openbsd_mips64.go
index 30f2853..1378489 100644
--- a/unix/syscall_openbsd_mips64.go
+++ b/unix/syscall_openbsd_mips64.go
@@ -26,6 +26,10 @@
 	msghdr.Controllen = uint32(length)
 }
 
+func (msghdr *Msghdr) SetIovlen(length int) {
+	msghdr.Iovlen = uint32(length)
+}
+
 func (cmsg *Cmsghdr) SetLen(length int) {
 	cmsg.Len = uint32(length)
 }