diff --git a/apps/stupid-interest-sink.h b/apps/stupid-interest-sink.h
index 66cedd9..b750907 100644
--- a/apps/stupid-interest-sink.h
+++ b/apps/stupid-interest-sink.h
@@ -1,3 +1,4 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 //
 //  stupid-interest-sink.h
 //  Abstraction
@@ -64,4 +65,4 @@
         TypeId          m_tid;          // Protocol TypeId
         TracedCallback<Ptr<const Packet>, const Address &> m_rxTrace;
     };
-}
\ No newline at end of file
+}