diff --git a/patch-diff-report-tool/src/main/java/com/github/checkstyle/site/TextTransform.java b/patch-diff-report-tool/src/main/java/com/github/checkstyle/site/TextTransform.java
index 960380b7..cb71ccfd 100644
--- a/patch-diff-report-tool/src/main/java/com/github/checkstyle/site/TextTransform.java
+++ b/patch-diff-report-tool/src/main/java/com/github/checkstyle/site/TextTransform.java
@@ -161,7 +161,7 @@ public void transform(String sourceFile, String destFile, Locale outputLocale,
      */
     private void transform(Reader sourceReader, Writer destWriter, Locale outputLocale,
             String outputEncoding) throws IOException {
-        this.locale = outputLocale;
+        locale = outputLocale;
         encoding = outputEncoding;
 
         final BufferedReader input = new BufferedReader(sourceReader);