diff --git a/common/modules/mixly-modules/common/serial.js b/common/modules/mixly-modules/common/serial.js
index 175aeb96..d950b924 100644
--- a/common/modules/mixly-modules/common/serial.js
+++ b/common/modules/mixly-modules/common/serial.js
@@ -218,6 +218,7 @@ class Serial {
 
     async close() {
         this.#isOpened_ = false;
+        this.#baud_ = 0;
     }
 
     async toggle() {