diff --git a/p4src/checksum_diff.p4 b/p4src/checksum_diff.p4
index 1c31691..5ee9d2f 100644
--- a/p4src/checksum_diff.p4
+++ b/p4src/checksum_diff.p4
@@ -5,6 +5,8 @@
 #include "headers.p4"
 #include "settings.p4"
 
+#define NICO_DELTA_CHECKSUM 1
+
 /*************************************************************************
  * Parser
 */