diff --git a/p4src/actions_delta_checksum.p4 b/p4src/actions_delta_checksum.p4
index af7c75c..d0c42ae 100644
--- a/p4src/actions_delta_checksum.p4
+++ b/p4src/actions_delta_checksum.p4
@@ -50,29 +50,33 @@ action delta_prepare()
     v6sum();
 }
 
-action delta_udp_from_v4_to_v6()
-{
-    delta_prepare();
-
-    bit<17> tmp = (bit<17>) hdr.udp.checksum + (bit<17>) meta.v6sum;
-    if (tmp[16:16] == 1) {
-        tmp = tmp + 1;
-        tmp[16:16] = 0;
-    }
-    tmp = tmp + (bit<17>) (0xffff - meta.v4sum);
-    if (tmp[16:16] == 1) {
-        tmp = tmp + 1;
-        tmp[16:16] = 0;
-    }
-
-    hdr.udp.checksum = (bit<16>) tmp;
-}
 
 #ifdef _SUME_SWITCH_P4_
 #define delta_udp_from_v6_to_v4 delta_prepare (); tmp17 = (bit<17>) hdr.udp.checksum + (bit<17>) meta.v4sum; if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; } tmp17 = tmp17 + (bit<17>) (0xffff - meta.v6sum); if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; }  hdr.udp.checksum = (bit<16>) tmp17;
 #define delta_tcp_from_v6_to_v4 delta_prepare (); tmp17 = (bit<17>) hdr.tcp.checksum + (bit<17>) meta.v4sum; if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; } tmp17 = tmp17 + (bit<17>) (0xffff - meta.v6sum); if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; }  hdr.tcp.checksum = (bit<16>) tmp17;
 
+#define delta_tcp_from_v4_to_v6 delta_prepare(); tmp17 = (bit<17>) hdr.tcp.checksum + (bit<17>) meta.v6sum; if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; } tmp17 = tmp17 + (bit<17>) (0xffff - meta.v4sum); if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; }  hdr.tcp.checksum = (bit<16>) tmp17;
+#define delta_udp_from_v4_to_v6 delta_prepare(); tmp17 = (bit<17>) hdr.udp.checksum + (bit<17>) meta.v6sum; if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; } tmp17 = tmp17 + (bit<17>) (0xffff - meta.v4sum); if (tmp17[16:16] == 1) { tmp17 = tmp17 + 1; tmp17[16:16] = 0; }  hdr.udp.checksum = (bit<16>) tmp17;
+
 #else
+action delta_tcp_from_v6_to_v4()
+{
+    delta_prepare();
+
+    bit<17> tmp = (bit<17>) hdr.tcp.checksum + (bit<17>) meta.v4sum;
+    if (tmp[16:16] == 1) {
+        tmp = tmp + 1;
+        tmp[16:16] = 0;
+    }
+    tmp = tmp + (bit<17>) (0xffff - meta.v6sum);
+    if (tmp[16:16] == 1) {
+        tmp = tmp + 1;
+        tmp[16:16] = 0;
+    }
+
+    hdr.tcp.checksum = (bit<16>) tmp;
+}
+
 action delta_udp_from_v6_to_v4()
 {
     delta_prepare();
@@ -108,26 +112,27 @@ action delta_tcp_from_v4_to_v6()
 
     hdr.tcp.checksum = (bit<16>) tmp;
 }
-#endif
 
-action delta_tcp_from_v6_to_v4()
+action delta_udp_from_v4_to_v6()
 {
     delta_prepare();
 
-    bit<17> tmp = (bit<17>) hdr.tcp.checksum + (bit<17>) meta.v4sum;
+    bit<17> tmp = (bit<17>) hdr.udp.checksum + (bit<17>) meta.v6sum;
     if (tmp[16:16] == 1) {
         tmp = tmp + 1;
         tmp[16:16] = 0;
     }
-    tmp = tmp + (bit<17>) (0xffff - meta.v6sum);
+    tmp = tmp + (bit<17>) (0xffff - meta.v4sum);
     if (tmp[16:16] == 1) {
         tmp = tmp + 1;
         tmp[16:16] = 0;
     }
 
-    hdr.tcp.checksum = (bit<16>) tmp;
+    hdr.udp.checksum = (bit<16>) tmp;
 }
 
+#endif
+
 action delta_ipv4_from_v6_to_v4()
 {
     bit<16> tmp = 0;