diff --git a/fake_tunnel_connector/server.rb b/fake_tunnel_connector/server.rb
index 070e890..1528f9a 100755
--- a/fake_tunnel_connector/server.rb
+++ b/fake_tunnel_connector/server.rb
@@ -3,6 +3,11 @@ require './http.rb'
 require './fake_tunnel_connector.rb'
 
 port = ARGV[0]
+if ARGV.count == 0
+  puts "Please provide a port for the server to listen on."
+  exit
+end
+
 cert_path = './certificate.pem'
 key_path = './private_key.pem'