diff --git a/p4src/minip4_solution.p4 b/p4src/minip4_solution.p4
index 0ce29d9..34693b6 100644
--- a/p4src/minip4_solution.p4
+++ b/p4src/minip4_solution.p4
@@ -56,7 +56,7 @@ parser TopParser(packet_in packet,
                  inout sume_metadata_t standard_metadata) {
 
     #include "parsers.p4"
-    digest_data.unused = 0; /* avoid compiler warning */
+
 }
 
 
diff --git a/p4src/parsers.p4 b/p4src/parsers.p4
index 25bada6..5c61b9a 100644
--- a/p4src/parsers.p4
+++ b/p4src/parsers.p4
@@ -17,6 +17,10 @@
         meta.v6sum           = 0;
         meta.headerdiff      = 0;
 
+        #ifdef _SUME_SWITCH_P4_
+    digest_data.unused = 0; /* avoid compiler warning */
+    #endif
+
         packet.extract(hdr.ethernet);
         transition select(hdr.ethernet.ethertype){
             TYPE_IPV4: ipv4;