diff --git a/components/dfs/filesystems/net/netinet/in.h b/components/dfs/filesystems/net/netinet/in.h
index 93469bc8e3245ad6c2b0c1f847c05266cf0b50a9..24fe8b5409015523689bb242e49a956ff53b78a5 100644
--- a/components/dfs/filesystems/net/netinet/in.h
+++ b/components/dfs/filesystems/net/netinet/in.h
@@ -27,4 +27,8 @@
 
 #include <lwip/sockets.h>
 
+#ifndef IN6_IS_ADDR_MULTICAST
+#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
+#endif
+
 #endif