diff --git a/src/main/java/net/floodlightcontroller/packet/ICMP.java b/src/main/java/net/floodlightcontroller/packet/ICMP.java
index 456dc544ea011c206914493165daa14c55baac60..9fc99256a98ab3bfb27f2f76cf21b766be2d31a4 100644
--- a/src/main/java/net/floodlightcontroller/packet/ICMP.java
+++ b/src/main/java/net/floodlightcontroller/packet/ICMP.java
@@ -28,8 +28,8 @@ public class ICMP extends BasePacket {
     protected byte icmpCode;
     protected short checksum;
 
-    public static byte ECHO_REPLY = 0x0;
-    public static byte ECHO_REQUEST = 0x8;
+    public static final byte ECHO_REPLY = 0x0;
+    public static final byte ECHO_REQUEST = 0x8;
 
     /**
      * @return the icmpType