diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index f70ba62..0b4e95f 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -970,6 +970,7 @@
 	case IGMP_MTRACE_RESP:
 		break;
 	default:
+		break;
 	}
 
 drop: