diff --git a/app/core/src/main/java/com/fsck/k9/K9.kt b/app/core/src/main/java/com/fsck/k9/K9.kt
index 53baf43f6ca3679f518a242a59078f137d36f621..ba824857c362402b076fdeda1cc6a97ddb0e6b5a 100644
--- a/app/core/src/main/java/com/fsck/k9/K9.kt
+++ b/app/core/src/main/java/com/fsck/k9/K9.kt
@@ -396,6 +396,7 @@ object K9 : EarlyInit {
         editor.putBoolean("useVolumeKeysForListNavigation", isUseVolumeKeysForListNavigation)
         editor.putBoolean("autofitWidth", isAutoFitWidth)
         editor.putBoolean("quietTimeEnabled", isQuietTimeEnabled)
+        editor.putBoolean("isSentSoundEnabled", isSentSoundEnabled)
         editor.putBoolean("notificationDuringQuietTimeEnabled", isNotificationDuringQuietTimeEnabled)
         editor.putString("quietTimeStarts", quietTimeStarts)
         editor.putString("quietTimeEnds", quietTimeEnds)