diff --git a/hio/configure b/hio/configure
index cbf1d0c..b802b27 100755
--- a/hio/configure
+++ b/hio/configure
@@ -18741,6 +18741,11 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+cat >>confdefs.h <<_ACEOF
+#define HIO_SIZEOF_SA_FAMILY_T ${ac_cv_sizeof_sa_family_t}
+_ACEOF
+
+
 
 hio_package_version_major="`echo ${PACKAGE_VERSION} | cut -d. -f1`"
 hio_package_version_minor="`echo ${PACKAGE_VERSION} | cut -d. -f2`"
diff --git a/hio/configure.ac b/hio/configure.ac
index 04590df..51b4809 100644
--- a/hio/configure.ac
+++ b/hio/configure.ac
@@ -739,6 +739,7 @@ AC_DEFINE_UNQUOTED(HIO_SIZEOF_STRUCT_SOCKADDR_UN, ${ac_cv_sizeof_struct_sockaddr
 AC_DEFINE_UNQUOTED(HIO_SIZEOF_STRUCT_SOCKADDR_LL, ${ac_cv_sizeof_struct_sockaddr_ll}, [sizeof(struct sockaddr_ll)])
 AC_DEFINE_UNQUOTED(HIO_SIZEOF_STRUCT_SOCKADDR_DL, ${ac_cv_sizeof_struct_sockaddr_dl}, [sizeof(struct sockaddr_dl)])
 AC_DEFINE_UNQUOTED(HIO_SIZEOF_SOCKLEN_T, ${ac_cv_sizeof_socklen_t}, [sizeof(socklen_t)])
+AC_DEFINE_UNQUOTED(HIO_SIZEOF_SA_FAMILY_T, ${ac_cv_sizeof_sa_family_t}, [sizeof(sa_family_t)])
 
 
 hio_package_version_major="`echo ${PACKAGE_VERSION} | cut -d. -f1`"
diff --git a/hio/lib/hio-cfg.h.in b/hio/lib/hio-cfg.h.in
index 1cb983e..27fc13d 100644
--- a/hio/lib/hio-cfg.h.in
+++ b/hio/lib/hio-cfg.h.in
@@ -633,6 +633,9 @@
 /* sizeof(off_t) */
 #undef HIO_SIZEOF_OFF_T
 
+/* sizeof(sa_family_t) */
+#undef HIO_SIZEOF_SA_FAMILY_T
+
 /* sizeof(short) */
 #undef HIO_SIZEOF_SHORT
 
diff --git a/hio/lib/hio-skad.h b/hio/lib/hio-skad.h
index adc68e8..a7af248 100644
--- a/hio/lib/hio-skad.h
+++ b/hio/lib/hio-skad.h
@@ -52,12 +52,24 @@
 #	define HIO_SIZEOF_SKAD_T HIO_SIZEOF_STRUCT_SOCKADDR_UN
 #endif
 
-#if !defined(HIO_AF_UNIX)
-	/* this is a fake value */
-#	define HIO_AF_UNIX (65534)
+#if (HIO_SIZEOF_SA_FAMILY_T == 1) && !defined(HIO_SA_FAMILY_T_IS_SIGNED)
+#	if !defined(HIO_AF_UNIX)
+#		define HIO_AF_UNIX (254)
+#	endif
+#	define HIO_AF_QX (255)
+#elif (HIO_SIZEOF_SA_FAMILY_T == 1) && defined(HIO_SA_FAMILY_T_IS_SIGNED)
+#	if !defined(HIO_AF_UNIX)
+#		define HIO_AF_UNIX (-2)
+#	endif
+#	define HIO_AF_QX (-1)
+#else
+#	if !defined(HIO_AF_UNIX)
+		/* this is a fake value */
+#		define HIO_AF_UNIX (65534)
+#	endif
+	/* this is HIO specific. No AF_XXXX definitions must overlap with this */
+#	define HIO_AF_QX (65530)
 #endif
-/* this is HIO specific. No AF_XXXX definitions must overlap with this */
-#define HIO_AF_QX (65530)
 
 struct hio_skad_t
 {