diff --git a/src/java.desktop/unix/classes/sun/awt/X11/XWM.java b/src/java.desktop/unix/classes/sun/awt/X11/XWM.java
index 093479b999e..a30dc5d5c76 100644
--- a/src/java.desktop/unix/classes/sun/awt/X11/XWM.java
+++ b/src/java.desktop/unix/classes/sun/awt/X11/XWM.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1738,9 +1738,7 @@ final class XWM
         correctWM.left = win.scaleUp(correctWM.left);
         correctWM.right = win.scaleUp(correctWM.right);
 
-        if (storedInsets.get(win.getClass()) == null) {
-            storedInsets.put(win.getClass(), correctWM);
-        }
+        storedInsets.putIfAbsent(win.getClass(), correctWM);
         return correctWM;
     }
     boolean isDesktopWindow( long w ) {