diff --git a/client/trino-cli/src/main/java/io/trino/cli/CsvPrinter.java b/client/trino-cli/src/main/java/io/trino/cli/CsvPrinter.java
index 466dd67ec595..c76c35cff4bd 100644
--- a/client/trino-cli/src/main/java/io/trino/cli/CsvPrinter.java
+++ b/client/trino-cli/src/main/java/io/trino/cli/CsvPrinter.java
@@ -43,8 +43,8 @@ public enum CsvOutputFormat
         NO_QUOTES(true, false),
         NO_HEADER_AND_QUOTES(false, false);
 
-        private boolean header;
-        private boolean quote;
+        private final boolean header;
+        private final boolean quote;
 
         CsvOutputFormat(boolean header, boolean quote)
         {