diff --git a/p4src/static-mapping.p4 b/p4src/static-mapping.p4
index ecddf2b..a4d933b 100644
--- a/p4src/static-mapping.p4
+++ b/p4src/static-mapping.p4
@@ -58,8 +58,8 @@ control MyIngress(inout headers hdr,
         hdr.ipv4.protocol = PROTO_ICMP; // overwrite generic same protocol assumption
 
         switch(hdr.icmp6.type) {
-            ICMP6_ECHO_REQUEST: hdr.icmp.type = ICMP_ECHO_REQUEST;
-            ICMP6_ECHO_REPLY:   hdr.icmp.type = ICMP_ECHO_REPLY;
+            ICMP6_ECHO_REQUEST: { hdr.icmp.type = ICMP_ECHO_REQUEST; }
+            ICMP6_ECHO_REPLY:   { hdr.icmp.type = ICMP_ECHO_REPLY; }
         }
 
         /* trigger checksumming */