diff --git a/tutorial/tutorial-csma-echo-pcap-trace.cc b/tutorial/tutorial-csma-echo-pcap-trace.cc
index feca0d427..7748dd5bd 100644
--- a/tutorial/tutorial-csma-echo-pcap-trace.cc
+++ b/tutorial/tutorial-csma-echo-pcap-trace.cc
@@ -61,7 +61,7 @@ main (int argc, char *argv[])
   apps.Start (Seconds (1.0));
   apps.Stop (Seconds (10.0));
 
-  CsmaHelper::EnablePcap ("tutorial.pcap");
+  CsmaHelper::EnablePcap ("tutorial");
   
   Simulator::Run ();
   Simulator::Destroy ();
diff --git a/tutorial/tutorial-linear-dumbbell.cc b/tutorial/tutorial-linear-dumbbell.cc
index 017d15860..723df6145 100644
--- a/tutorial/tutorial-linear-dumbbell.cc
+++ b/tutorial/tutorial-linear-dumbbell.cc
@@ -140,8 +140,8 @@ main (int argc, char *argv[])
   PointToPointHelper::EnableAscii (os);
   CsmaHelper::EnableAscii (os);
 
-  PointToPointHelper::EnablePcap ("tutorial.pcap");
-  CsmaHelper::EnablePcap ("tutorial.pcap");
+  PointToPointHelper::EnablePcap ("tutorial");
+  CsmaHelper::EnablePcap ("tutorial");
 
   Simulator::Run ();
   Simulator::Destroy ();