diff --git a/src/inet/common/serializer/sctp/headers/sctphdr.h b/src/inet/common/serializer/sctp/headers/sctphdr.h
index 6e7560435..115b1aa60 100644
--- a/src/inet/common/serializer/sctp/headers/sctphdr.h
+++ b/src/inet/common/serializer/sctp/headers/sctphdr.h
@@ -412,7 +412,7 @@ struct heartbeat_info
     uint16_t length;
     union
     {
-        uint8_t info[];
+        uint8_t info[0];
         struct
         {
             union