diff --git a/gobblin-core/src/main/java/gobblin/source/extractor/hadoop/HadoopFsHelper.java b/gobblin-core/src/main/java/gobblin/source/extractor/hadoop/HadoopFsHelper.java
index 9807739f6ec..b22b2fbf55c 100644
--- a/gobblin-core/src/main/java/gobblin/source/extractor/hadoop/HadoopFsHelper.java
+++ b/gobblin-core/src/main/java/gobblin/source/extractor/hadoop/HadoopFsHelper.java
@@ -42,7 +42,7 @@
 public class HadoopFsHelper implements FileBasedHelper {
   private static Logger log = LoggerFactory.getLogger(HadoopFsHelper.class);
   private State state;
-  private Configuration configuration;
+  private final Configuration configuration;
   private FileSystem fs;
 
   public HadoopFsHelper(State state) {