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 e03ed95a2..3ac77ede6 100644
--- a/src/test/java/org/apache/commons/lang3/StringUtilsEqualsIndexOfTest.java
+++ b/src/test/java/org/apache/commons/lang3/StringUtilsEqualsIndexOfTest.java
@@ -466,7 +466,7 @@ public class StringUtilsEqualsIndexOfTest  {
     // 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 CharSequence seq;
+        private final CharSequence seq;
 
         public CustomCharSequence(CharSequence seq) {
             this.seq = seq;