diff --git a/tck/src/main/java/ee/jakarta/tck/json/bind/customizedmapping/numberformat/model/FieldCustomizedDoubleContainer.java b/tck/src/main/java/ee/jakarta/tck/json/bind/customizedmapping/numberformat/model/FieldCustomizedDoubleContainer.java
index f6fe71a5..a64cec75 100644
--- a/tck/src/main/java/ee/jakarta/tck/json/bind/customizedmapping/numberformat/model/FieldCustomizedDoubleContainer.java
+++ b/tck/src/main/java/ee/jakarta/tck/json/bind/customizedmapping/numberformat/model/FieldCustomizedDoubleContainer.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2022 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2025 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -25,7 +25,7 @@
 import ee.jakarta.tck.json.bind.TypeContainer;
 
 public class FieldCustomizedDoubleContainer implements TypeContainer<Double> {
-    @JsonbNumberFormat(locale = "fr")
+    @JsonbNumberFormat(locale = "fi")
     private Double instance;
 
     @Override