diff --git a/heron/io/dlog/src/java/com/twitter/heron/dlog/Util.java b/heron/io/dlog/src/java/com/twitter/heron/dlog/Util.java
index e5c6c05..bfb7011 100644
--- a/heron/io/dlog/src/java/com/twitter/heron/dlog/Util.java
+++ b/heron/io/dlog/src/java/com/twitter/heron/dlog/Util.java
@@ -35,6 +35,9 @@
  */
 public final class Util {
 
+  private Util() {
+  }
+
   public static void main(String[] args) throws Exception {
     if (args.length != 2) {
       System.err.println("Usage : Util <src> <target>");