diff --git a/src/add-ons/kernel/network/datalink_protocols/ipv6_datagram/ipv6_datagram.cpp b/src/add-ons/kernel/network/datalink_protocols/ipv6_datagram/ipv6_datagram.cpp
index e38c43326a..559a1d261d 100644
--- a/src/add-ons/kernel/network/datalink_protocols/ipv6_datagram/ipv6_datagram.cpp
+++ b/src/add-ons/kernel/network/datalink_protocols/ipv6_datagram/ipv6_datagram.cpp
@@ -92,7 +92,7 @@ struct router_advertisement_header {
 	uint16		router_lifetime;
 	uint32		reachable_time;
 	uint32		retransmit_timer;
-	uint8		options[];
+	uint8		options[0];
 } _PACKED;