diff --git a/include/re_sa.h b/include/re_sa.h
index f351fae..4492922 100644
--- a/include/re_sa.h
+++ b/include/re_sa.h
@@ -30,6 +30,7 @@ struct sa {
 #ifdef HAVE_INET6
 		struct sockaddr_in6 in6;
 #endif
+		uint8_t padding[28];
 	} u;
 	socklen_t len;
 };