diff --git a/bpf/progs/clatd.c b/bpf/progs/clatd.c
index 2d4551e..2bb9d6f 100644
--- a/bpf/progs/clatd.c
+++ b/bpf/progs/clatd.c
@@ -288,6 +288,9 @@
     // We cannot handle IP options, just standard 20 byte == 5 dword minimal IPv4 header
     if (ip4->ihl != 5) return TC_ACT_PIPE;
 
+    // Packet must not be multicast
+    if ((ip4->daddr & 0xf0000000) == 0xe0000000) return TC_ACT_PIPE;
+
     // Calculate the IPv4 one's complement checksum of the IPv4 header.
     __wsum sum4 = 0;
     for (unsigned i = 0; i < sizeof(*ip4) / sizeof(__u16); ++i) {