diff --git a/Kapitel 4/4.2.3/controls-checkbox/src/main/java/de/javafxbuch/MainApp.java b/Kapitel 4/4.2.3/controls-checkbox/src/main/java/de/javafxbuch/MainApp.java
index 486b349..ac8284a 100644
--- a/Kapitel 4/4.2.3/controls-checkbox/src/main/java/de/javafxbuch/MainApp.java	
+++ b/Kapitel 4/4.2.3/controls-checkbox/src/main/java/de/javafxbuch/MainApp.java	
@@ -17,6 +17,7 @@ public void start(Stage primaryStage) {
 
         CheckBox checkBox = new CheckBox("I'm undecided");
         checkBox.setAllowIndeterminate(true);
+        checkBox.setIndeterminate(false);
         checkBox.setOnAction(e -> {
             if (checkBox.isIndeterminate()) {
                 checkBox.setText("I'm undecided");