diff --git a/unix.c b/unix.c
index e279bfe..132ca1a 100644
--- a/unix.c
+++ b/unix.c
@@ -274,6 +274,8 @@ enet_socket_send (ENetSocket socket,
 
     if (address != NULL)
     {
+        memset (& sin, 0, sizeof (struct sockaddr_in));
+
         sin.sin_family = AF_INET;
         sin.sin_port = ENET_HOST_TO_NET_16 (address -> port);
         sin.sin_addr.s_addr = address -> host;
diff --git a/win32.c b/win32.c
index 27e7877..b8b2aa7 100644
--- a/win32.c
+++ b/win32.c
@@ -225,6 +225,8 @@ enet_socket_send (ENetSocket socket,
 
     if (address != NULL)
     {
+        memset (& sin, 0, sizeof (struct sockaddr_in));
+
         sin.sin_family = AF_INET;
         sin.sin_port = ENET_HOST_TO_NET_16 (address -> port);
         sin.sin_addr.s_addr = address -> host;