diff --git a/lowlevel/AtomicSerialNumbers.java b/lowlevel/AtomicSerialNumbers.java
index 53547bcc..ed063c86 100644
--- a/lowlevel/AtomicSerialNumbers.java
+++ b/lowlevel/AtomicSerialNumbers.java
@@ -8,7 +8,7 @@ public class
 AtomicSerialNumbers extends SerialNumbers {
   private AtomicInteger serialNumber =
     new AtomicInteger();
-  public synchronized int nextSerialNumber() {
+  public int nextSerialNumber() {
     return serialNumber.getAndIncrement();
   }
   public static void main(String[] args) {