diff --git a/xs/xs.go b/xs/xs.go
index 382e158..b232afc 100755
--- a/xs/xs.go
+++ b/xs/xs.go
@@ -972,7 +972,7 @@ func main() { //nolint: funlen, gocyclo
 	
 	remodExtArg := ""
 	if remodRequested {
-		remodExtArg = "-R"
+		remodExtArg = "OPT_REMOD"
 	}
 	// Pass opt to Dial() via extensions arg
 	conn, err := xsnet.Dial(proto, server, cipherAlg, hmacAlg, kexAlg, kcpMode, remodExtArg)
diff --git a/xsd/xsd.go b/xsd/xsd.go
index 70f956b..4dff136 100755
--- a/xsd/xsd.go
+++ b/xsd/xsd.go
@@ -709,7 +709,7 @@ func main() { //nolint:funlen,gocyclo
 				// proposes to use it.
 				if !remodSupported {
 					if (conn.Opts() & xsnet.CORemodulateShields) != 0 {
-						logger.LogDebug("[client proposed -R, but we don't support it.]")
+						logger.LogDebug("[client proposed cipher/hmac remod, but we don't support it.]")
 						conn.Close()
 						continue
 					}
diff --git a/xsnet/net.go b/xsnet/net.go
index a1ca072..945a362 100644
--- a/xsnet/net.go
+++ b/xsnet/net.go
@@ -363,8 +363,8 @@ func (hc *Conn) applyConnExtensions(extensions ...string) {
 			log.Println("[extension arg = H_SHA512]")
 			hc.cipheropts &= (0xFFFF00FF)
 			hc.cipheropts |= (HmacSHA512 << 8)
-		case "-R":
-			log.Println("[extension arg = -R]")
+		case "OPT_REMOD":
+			log.Println("[extension arg = OPT_REMOD]")
 			hc.opts |= CORemodulateShields
 		//default:
 		//	log.Printf("[Dial ext \"%s\" ignored]\n", s)