dht-bootstrap.c | 2 ++

diff --git a/dht-bootstrap.c b/dht-bootstrap.c
index c9582b2c12cd6b090ed53fb95fefbd4cabb39ced..d96b0f7a763623dd93c53684ac3ca140d8248798 100644
--- a/dht-bootstrap.c
+++ b/dht-bootstrap.c
@@ -427,6 +427,7 @@     if(dht_socket >= 0) {
         struct sockaddr_in sin;
         int rc;
         memset(&sin, 0, sizeof(sin));
+        sin.sin_family = AF_INET;
         sin.sin_port = htons(port);
         rc = bind(dht_socket, (struct sockaddr*)&sin, sizeof(sin));
         if(rc < 0) {
@@ -464,6 +465,7 @@            global IPv6 addresses.  In this simple example, this only
            happens if the user used the -b flag. */
 
         memset(&sin6, 0, sizeof(sin6));
+        sin6.sin6_family = AF_INET6;
         sin6.sin6_port = htons(port);
         rc = bind(dht_socket6, (struct sockaddr*)&sin6, sizeof(sin6));
         if(rc < 0) {