diff --git a/examples/tutorial/first.cc b/examples/tutorial/first.cc
index 36a05b403..f01f88b87 100644
--- a/examples/tutorial/first.cc
+++ b/examples/tutorial/first.cc
@@ -56,7 +56,7 @@ main (int argc, char *argv[])
 
   UdpEchoClientHelper echoClient (interfaces.GetAddress (1), 9);
   echoClient.SetAttribute ("MaxPackets", UintegerValue (1));
-  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.)));
+  echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
   echoClient.SetAttribute ("PacketSize", UintegerValue (1024));
 
   ApplicationContainer clientApps = echoClient.Install (nodes.Get (0));