1 files changed, 1 insertions, 1 deletions
diff --git a/src/test/java/org/apache/commons/lang3/builder/ToStringStyleTest.java b/src/test/java/org/apache/commons/lang3/builder/ToStringStyleTest.java
index 02399b6db..1f30fbeab 100644
--- a/src/test/java/org/apache/commons/lang3/builder/ToStringStyleTest.java
+++ b/src/test/java/org/apache/commons/lang3/builder/ToStringStyleTest.java
@@ -26,7 +26,7 @@ import org.junit.jupiter.api.Test;
  */
 public class ToStringStyleTest extends AbstractLangTest {
 
-    private static class ToStringStyleImpl extends ToStringStyle {
+    private static final class ToStringStyleImpl extends ToStringStyle {
         private static final long serialVersionUID = 1L;
 
     }