diff --git a/net/netcheck/netcheck.go b/net/netcheck/netcheck.go
index 54f31f065..5c4a6391d 100644
--- a/net/netcheck/netcheck.go
+++ b/net/netcheck/netcheck.go
@@ -208,7 +208,6 @@ type Client struct {
 // reusing an existing UDP connection.
 type STUNConn interface {
 	WriteToUDPAddrPort([]byte, netip.AddrPort) (int, error)
-	WriteTo([]byte, net.Addr) (int, error)
 	ReadFrom([]byte) (int, net.Addr, error)
 }