diff --git a/src/main/java/info/istlab/IoTP/Launcher.java b/src/main/java/info/istlab/IoTP/Launcher.java
index af831b8..1bb8845 100644
--- a/src/main/java/info/istlab/IoTP/Launcher.java
+++ b/src/main/java/info/istlab/IoTP/Launcher.java
@@ -91,7 +91,7 @@
         menuBar.add(menu);
 
         mi = new JMenuItem("シリアルモニタを開く");
-        mi.addActionListener(ae -> SerialWindow.invoke() );
+        mi.addActionListener(ae -> SerialWindow.invoke(true) );
         menu.add(mi);
 
         menu = new JMenu("File"); /**************************************************** */