diff --git a/app/src/main/java/io/github/hizumiaoba/mctimemachine/MainController.java b/app/src/main/java/io/github/hizumiaoba/mctimemachine/MainController.java
index 40b8b41..dfe7eef 100644
--- a/app/src/main/java/io/github/hizumiaoba/mctimemachine/MainController.java
+++ b/app/src/main/java/io/github/hizumiaoba/mctimemachine/MainController.java
@@ -157,7 +157,7 @@ void initialize() {
         specialBackupNowWithShortcutChkbox.isSelected() ? "true" : "false");
       mainConfig.set("exit_on_quitting_minecraft",
         enableAutoExitOnQuittingGamesChkbox.isSelected() ? "true" : "false");
-      mainConfig.set("exit_on_quitting_minecraft",
+      mainConfig.set("backup_on_quitting_minecraft",
         enableAutoBackupOnQuittingGamesChkbox.isSelected() ? "true" : "false");
       mainConfig.save();
       es.shutdownNow();