diff --git a/include/nuttx/net/dns.h b/include/nuttx/net/dns.h
index 8c11147e7ed..b9f0cb955a2 100644
--- a/include/nuttx/net/dns.h
+++ b/include/nuttx/net/dns.h
@@ -56,14 +56,14 @@
 /* DNS classes */
 
 #define DNS_CLASS_IN                1 /* RFC 1035 Internet */
-#define DNS_CLASS CH                3 /* N/A      Chaos */
+#define DNS_CLASS_CH                3 /* N/A      Chaos */
 #define DNS_CLASS_HS                4 /* N/A      Hesiod */
 #define DNS_CLASS_QNONE           254 /* RFC 2136 QCLASS NONE */
 #define DNS_CLASS_QANY            255 /* RFC 1035 QCLASS ANY */
 
 /* DNS resource record types */
 
-#define DNS_RECTYPE_A                1 /* RFC 1035 IPv4 ddress record */
+#define DNS_RECTYPE_A                1 /* RFC 1035 IPv4 address record */
 #define DNS_RECTYPE_AAAA            28 /* RFC 3596 IPv6 address record */
 #define DNS_RECTYPE_AFSDB           18 /* RFC 1183 AFS database record */
 #define DNS_RECTYPE_APL             42 /* RFC 3123 Address Prefix List */
diff --git a/libc/netdb/lib_dnsquery.c b/libc/netdb/lib_dnsquery.c
index 117cc0926a0..0da2ebfc976 100644
--- a/libc/netdb/lib_dnsquery.c
+++ b/libc/netdb/lib_dnsquery.c
@@ -393,7 +393,7 @@ static int dns_recv_response(int sd, FAR struct sockaddr *addr,
       if (ans->type  == HTONS(DNS_RECTYPE_A) &&
           ans->class == HTONS(DNS_CLASS_IN) &&
           ans->len   == HTONS(4) &&
-          nameptr + 10 + 4 < endofbuffer)
+          nameptr + 10 + 4 <= endofbuffer)
         {
           ans->u.ipv4.s_addr = *(FAR uint32_t *)(nameptr + 10);
 
@@ -426,7 +426,7 @@ static int dns_recv_response(int sd, FAR struct sockaddr *addr,
       if (ans->type  == HTONS(DNS_RECTYPE_AAAA) &&
           ans->class == HTONS(DNS_CLASS_IN) &&
           ans->len   == HTONS(16) &&
-          nameptr + 10 + 16 < endofbuffer)
+          nameptr + 10 + 16 <= endofbuffer)
         {
           memcpy(&ans->u.ipv6.s6_addr, nameptr + 10, 16);