diff --git a/tools/scat.c b/tools/scat.c
index 4f19c236b..41234ac81 100644
--- a/tools/scat.c
+++ b/tools/scat.c
@@ -26,7 +26,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
  *
- * $Id: scat.c,v 1.5 2007/02/02 13:26:49 bg- Exp $
+ * $Id: scat.c,v 1.6 2007/05/21 15:22:45 bg- Exp $
  *
  */
 
@@ -148,6 +148,8 @@ main(int argc, char **argv)
     err(1, "usage: scat device-file");
   siodev = argv[1];
 
+  setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
+
   slipfd = open(siodev, O_RDWR);
   if (slipfd == -1) err(1, "can't open '%s'", siodev);
   stty_telos(slipfd);
diff --git a/tools/tunslip.c b/tools/tunslip.c
index f555ed81c..a5d6acbc7 100644
--- a/tools/tunslip.c
+++ b/tools/tunslip.c
@@ -28,7 +28,7 @@
  *
  * This file is part of the uIP TCP/IP stack.
  *
- * $Id: tunslip.c,v 1.13 2007/05/02 08:58:00 bg- Exp $
+ * $Id: tunslip.c,v 1.14 2007/05/21 15:22:56 bg- Exp $
  *
  */
 
@@ -865,6 +865,8 @@ main(int argc, char **argv)
 
   ip_id = getpid() * time(NULL);
 
+  setvbuf(stdout, NULL, _IOLBF, 0); /* Line buffered output. */
+
   while ((c = getopt(argc, argv, "B:D:hs:t:")) != -1) {
     switch (c) {
     case 'B':