diff --git a/callback/src/main/java/com/iluwatar/callback/LambdasApp.java b/callback/src/main/java/com/iluwatar/callback/LambdasApp.java
index aa57a0f7c..19dd17eae 100644
--- a/callback/src/main/java/com/iluwatar/callback/LambdasApp.java
+++ b/callback/src/main/java/com/iluwatar/callback/LambdasApp.java
@@ -11,7 +11,7 @@ public class LambdasApp {
   /**
    * Program entry point
    */
-  public static void main(String[] args){
+  public static void main(String[] args) {
     Task task = new SimpleTask();
     Callback c = () -> System.out.println("I'm done now.");
     task.executeWith(c);