diff --git a/app/proxyman/outbound/handler.go b/app/proxyman/outbound/handler.go
index ef057399..0aeb830e 100644
--- a/app/proxyman/outbound/handler.go
+++ b/app/proxyman/outbound/handler.go
@@ -114,8 +114,10 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 
 	if h.senderSettings != nil && h.senderSettings.MultiplexSettings != nil {
 		if config := h.senderSettings.MultiplexSettings; config.Enabled {
-			MaxReuseTimes := uint32(65535) // as many as possible
-			if config.MaxReuseTimes != 0 {
+			// MaxReuseTimes use 65535 as default, and it also means the upper limit of MaxReuseTimes
+			// Because in mux cool spec, connection ID is 2 bytes
+			MaxReuseTimes := uint32(65535)
+			if config.MaxReuseTimes != 0 && config.MaxReuseTimes < 65535 {
 				MaxReuseTimes = uint32(config.MaxReuseTimes)
 			}
 			if config.Concurrency < 0 {