diff --git a/src/net/lookup_windows.go b/src/net/lookup_windows.go
index 784763aea9..f059d6178b 100644
--- a/src/net/lookup_windows.go
+++ b/src/net/lookup_windows.go
@@ -19,7 +19,7 @@ var (
 func getprotobyname(name string) (proto int, err error) {
 	p, err := syscall.GetProtoByName(name)
 	if err != nil {
-		return 0, os.NewSyscallError("getorotobyname", err)
+		return 0, os.NewSyscallError("getprotobyname", err)
 	}
 	return int(p.Proto), nil
 }