Make private static classes final

1 files changed, 1 insertions, 1 deletions

diff --git a/src/test/java/org/apache/commons/lang3/StringUtilsEqualsIndexOfTest.java b/src/test/java/org/apache/commons/lang3/StringUtilsEqualsIndexOfTest.java
index 456018f0e..db36fd30e 100644
--- a/src/test/java/org/apache/commons/lang3/StringUtilsEqualsIndexOfTest.java
+++ b/src/test/java/org/apache/commons/lang3/StringUtilsEqualsIndexOfTest.java
@@ -46,7 +46,7 @@ public class StringUtilsEqualsIndexOfTest extends AbstractLangTest {
     // with a CharSequence implementation whose equals(Object) override requires that the
     // other object be an instance of CustomCharSequence, even though, as char sequences,
     // `seq` may equal the other object.
-    private static class CustomCharSequence implements CharSequence {
+    private static final class CustomCharSequence implements CharSequence {
         private final CharSequence seq;
 
         CustomCharSequence(final CharSequence seq) {