diff --git a/weasis-dicom-tools/src/test/java/org/dcm4che3/img/util/DicomUtilsTest.java b/weasis-dicom-tools/src/test/java/org/dcm4che3/img/util/DicomUtilsTest.java
index 123cddc..e4118b4 100644
--- a/weasis-dicom-tools/src/test/java/org/dcm4che3/img/util/DicomUtilsTest.java
+++ b/weasis-dicom-tools/src/test/java/org/dcm4che3/img/util/DicomUtilsTest.java
@@ -39,15 +39,16 @@
 @TestInstance(
     TestInstance.Lifecycle.PER_CLASS) // To enable BeforeAll and AfterAll for Locale.setDefault()
 class DicomUtilsTest {
-  static final Locale defaultLocale = Locale.getDefault();
+  private Locale defaultLocale;
 
   @BeforeAll
-  static void setUp() {
+  void setUp() {
+    defaultLocale = Locale.getDefault();
     Locale.setDefault(Locale.US); // Force Locale for testing date format
   }
 
   @AfterAll
-  static void tearDown() {
+  void tearDown() {
     Locale.setDefault(defaultLocale);
   }
 
diff --git a/weasis-dicom-tools/src/test/java/org/weasis/dicom/ref/AnatomicBuilderTest.java b/weasis-dicom-tools/src/test/java/org/weasis/dicom/ref/AnatomicBuilderTest.java
index de8329c..968fb9f 100644
--- a/weasis-dicom-tools/src/test/java/org/weasis/dicom/ref/AnatomicBuilderTest.java
+++ b/weasis-dicom-tools/src/test/java/org/weasis/dicom/ref/AnatomicBuilderTest.java
@@ -26,15 +26,16 @@
 @TestInstance(
     TestInstance.Lifecycle.PER_CLASS) // To enable BeforeAll and AfterAll for Locale.setDefault()
 class AnatomicBuilderTest {
-  static final Locale defaultLocale = Locale.getDefault();
+  private Locale defaultLocale;
 
   @BeforeAll
-  static void setUp() {
+  void setUp() {
+    defaultLocale = Locale.getDefault();
     Locale.setDefault(Locale.FRENCH); // Force Locale for testing translation
   }
 
   @AfterAll
-  static void tearDown() {
+  void tearDown() {
     Locale.setDefault(defaultLocale);
   }