diff --git a/sys/dvb/camswclient.c b/sys/dvb/camswclient.c
index 32c6a221ec..ef381e42d4 100644
--- a/sys/dvb/camswclient.c
+++ b/sys/dvb/camswclient.c
@@ -77,6 +77,7 @@ cam_sw_client_open (CamSwClient * client, const char *sock_path)
   g_return_val_if_fail (client != NULL, FALSE);
   g_return_val_if_fail (client->state == CAM_SW_CLIENT_STATE_CLOSED, FALSE);
   g_return_val_if_fail (sock_path != NULL, FALSE);
+  g_return_val_if_fail (strlen (sock_path) >= sizeof (addr.sun_path));
 
   addr.sun_family = AF_UNIX;
   strncpy (addr.sun_path, sock_path, sizeof (addr.sun_path));