diff --git a/src/internal/poll/sockopt_windows.go b/src/internal/poll/sockopt_windows.go
index dd5fb70babd..f32bca4f0fe 100644
--- a/src/internal/poll/sockopt_windows.go
+++ b/src/internal/poll/sockopt_windows.go
@@ -6,15 +6,6 @@ package poll
 
 import "syscall"
 
-// Setsockopt wraps the setsockopt network call.
-func (fd *FD) Setsockopt(level, optname int32, optval *byte, optlen int32) error {
-	if err := fd.incref(); err != nil {
-		return err
-	}
-	defer fd.decref()
-	return syscall.Setsockopt(fd.Sysfd, level, optname, optval, optlen)
-}
-
 // WSAIoctl wraps the WSAIoctl network call.
 func (fd *FD) WSAIoctl(iocc uint32, inbuf *byte, cbif uint32, outbuf *byte, cbob uint32, cbbr *uint32, overlapped *syscall.Overlapped, completionRoutine uintptr) error {
 	if err := fd.incref(); err != nil {
diff --git a/src/net/sockoptip_windows.go b/src/net/sockoptip_windows.go
index 62676039a3b..9dfa37c51e9 100644
--- a/src/net/sockoptip_windows.go
+++ b/src/net/sockoptip_windows.go
@@ -8,7 +8,6 @@ import (
 	"os"
 	"runtime"
 	"syscall"
-	"unsafe"
 )
 
 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
@@ -18,7 +17,7 @@ func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
 	}
 	var a [4]byte
 	copy(a[:], ip.To4())
-	err = fd.pfd.Setsockopt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, (*byte)(unsafe.Pointer(&a[0])), 4)
+	err = fd.pfd.SetsockoptInet4Addr(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, a)
 	runtime.KeepAlive(fd)
 	return wrapSyscallError("setsockopt", err)
 }