diff --git a/configure.ac b/configure.ac
index 77a94626..ca5dfc38 100644
--- a/configure.ac
+++ b/configure.ac
@@ -166,6 +166,12 @@ AC_CHECK_LIB([socket], [socket])
 AC_CHECK_FUNCS([epoll_create], [AC_DEFINE([HAVE_EPOLL])])
 AC_CHECK_FUNCS([kqueue], [AC_DEFINE([HAVE_KQUEUE])])
 
+dnl Check if struct sockaddr contains sa_len member
+AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [], [
+# include <sys/types.h>
+# include <sys/socket.h>
+])
+
 ################################################################################
 #  Libtool                                                                     #
 ################################################################################
diff --git a/dns/dns.c b/dns/dns.c
index 9130a2aa..630dcef4 100644
--- a/dns/dns.c
+++ b/dns/dns.c
@@ -23,11 +23,19 @@
  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  * ==========================================================================
  */
+#ifdef  HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #if !defined(__FreeBSD__) && !defined(__sun)
 #ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE	600
 #endif
 
+#if defined(__FreeBSD__)
+#define HAVE_STRUCT_SOCKADDR_SA_LEN
+#endif
+
 #undef _BSD_SOURCE
 #define _BSD_SOURCE
 
@@ -807,6 +815,9 @@ static int dns_inet_pton(int af, const void *src, void *dst) {
 	union { struct sockaddr_in sin; struct sockaddr_in6 sin6; } u;
 
 	u.sin.sin_family	= af;
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+	u.sin.sin_len       = dns_af_len(af);
+#endif
 
 	if (0 != WSAStringToAddressA((void *)src, af, (void *)0, (struct sockaddr *)&u, &(int){ sizeof u }))
 		return -1;
@@ -832,6 +843,9 @@ static const char *dns_inet_ntop(int af, const void *src, void *dst, unsigned lo
 	memset(&u, 0, sizeof u);
 
 	u.sin.sin_family	= af;
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+	u.sin.sin_len       = dns_af_len(af);
+#endif
 
 	switch (af) {
 	case AF_INET6:
@@ -3877,8 +3891,8 @@ struct dns_resolv_conf *dns_resconf_open(int *error) {
 	sin->sin_family      = AF_INET;
 	sin->sin_addr.s_addr = INADDR_ANY;
 	sin->sin_port        = htons(53);
-#if defined(SA_LEN)
-	sin->sin_len         = sizeof *sin;
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+	sin->sin_len         = dns_af_len(sin->sin_family);
 #endif
 
 	if (0 != gethostname(resconf->search[0], sizeof resconf->search[0]))
@@ -6871,6 +6885,9 @@ static int dns_res_exec(struct dns_resolver *R) {
 		}
 
 		sin.sin_family	= AF_INET;
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+		sin.sin_len     = dns_af_len(sin.sin_family);
+#endif
 
 		if ((error = dns_a_parse((struct dns_a *)&sin.sin_addr, &rr, F->hints)))
 			goto error;
@@ -7429,6 +7446,9 @@ static int dns_ai_setent(struct addrinfo **ent, union dns_any *any, enum dns_typ
 
 		sin.sin_family	= AF_INET;
 		sin.sin_port	= htons(ai->port);
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+		sin.sin_len     = dns_af_len(sin.sin_family);
+#endif
 
 		memcpy(&sin.sin_addr, any, sizeof sin.sin_addr);
 
@@ -7438,6 +7458,9 @@ static int dns_ai_setent(struct addrinfo **ent, union dns_any *any, enum dns_typ
 
 		sin6.sin6_family	= AF_INET6;
 		sin6.sin6_port		= htons(ai->port);
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+		sin6.sin6_len        = dns_af_len(sin6.sin6_family);
+#endif
 
 		memcpy(&sin6.sin6_addr, any, sizeof sin6.sin6_addr);
 
@@ -8785,6 +8808,9 @@ static int echo_port(int argc DNS_NOTUSED, char *argv[] DNS_NOTUSED) {
 	port.sin.sin_family = AF_INET;
 	port.sin.sin_port = htons(5354);
 	port.sin.sin_addr.s_addr = inet_addr("127.0.0.1");
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+	port.sin.sin_len  = dns_af_len(port.sin.sin_family);
+#endif
 
 	if (-1 == (fd = socket(PF_INET, SOCK_DGRAM, 0)))
 		panic("socket: %s", strerror(errno));
diff --git a/ipaddr.c b/ipaddr.c
index a6cf3818..bc960cb1 100644
--- a/ipaddr.c
+++ b/ipaddr.c
@@ -62,6 +62,9 @@ static int ipaddr_ipany(struct ipaddr *addr, int port, int mode)
         ipv4->sin_family = AF_INET;
         ipv4->sin_addr.s_addr = htonl(INADDR_ANY);
         ipv4->sin_port = htons((uint16_t)port);
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+        ipv4->sin_len = sizeof(struct sockaddr_in);
+#endif
         return 0;
     }
     else {
@@ -69,6 +72,9 @@ static int ipaddr_ipany(struct ipaddr *addr, int port, int mode)
         ipv6->sin6_family = AF_INET6;
         memcpy(&ipv6->sin6_addr, &in6addr_any, sizeof(in6addr_any));
         ipv6->sin6_port = htons((uint16_t)port);
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+        ipv6->sin6_len = sizeof(struct sockaddr_in6);
+#endif
         return 0;
     }
 }
@@ -82,6 +88,9 @@ static int ipaddr_ipv4_literal(struct ipaddr *addr, const char *name,
     if(dill_slow(rc != 1)) {errno = EINVAL; return -1;}
     ipv4->sin_family = AF_INET;
     ipv4->sin_port = htons((uint16_t)port);
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+    ipv4->sin_len = sizeof(struct sockaddr_in);
+#endif
     return 0;
 }
 
@@ -94,6 +103,9 @@ static int ipaddr_ipv6_literal(struct ipaddr *addr, const char *name,
     if(dill_slow(rc != 1)) {errno = EINVAL; return -1;}
     ipv6->sin6_family = AF_INET6;
     ipv6->sin6_port = htons((uint16_t)port);
+#ifdef  HAVE_STRUCT_SOCKADDR_SA_LEN
+    ipv6->sin6_len = sizeof(struct sockaddr_in6);
+#endif
     return 0;
 }