diff --git a/include/nuttx/net/dns.h b/include/nuttx/net/dns.h
index 12b5675135..5bd39421be 100644
--- a/include/nuttx/net/dns.h
+++ b/include/nuttx/net/dns.h
@@ -138,7 +138,7 @@
 
 /* The DNS message header */
 
-struct dns_header_s
+begin_packed_struct struct dns_header_s
 {
   uint16_t id;
   uint8_t  flags1;
@@ -147,15 +147,15 @@ struct dns_header_s
   uint16_t numanswers;
   uint16_t numauthrr;
   uint16_t numextrarr;
-};
+} end_packed_struct;
 
 /* The DNS question message structure */
 
-struct dns_question_s
+begin_packed_struct struct dns_question_s
 {
   uint16_t type;
   uint16_t class;
-};
+} end_packed_struct;
 
 /* The DNS answer message structure */