diff --git a/codec-dns/src/main/java/io/netty/handler/codec/dns/DnsOpCode.java b/codec-dns/src/main/java/io/netty/handler/codec/dns/DnsOpCode.java
index f14211a793..8316ef453d 100644
--- a/codec-dns/src/main/java/io/netty/handler/codec/dns/DnsOpCode.java
+++ b/codec-dns/src/main/java/io/netty/handler/codec/dns/DnsOpCode.java
@@ -65,6 +65,8 @@ public class DnsOpCode implements Comparable<DnsOpCode> {
             return NOTIFY;
         case 0x05:
             return UPDATE;
+        default:
+            break;
         }
 
         return new DnsOpCode(b);