diff --git a/server_test.go b/server_test.go
index 3f7da2f..6a8d043 100644
--- a/server_test.go
+++ b/server_test.go
@@ -27,13 +27,13 @@ func (s *ServerSuite) TestTailFile(c *C) {
 	server := NewServer()
 	server.SetFormat(RFC3164)
 	server.SetHandler(handler)
-	server.ListenUDP("0.0.0.0:5141")
-	server.ListenTCP("0.0.0.0:5141")
+	server.ListenUDP("127.0.0.1:0")
+	server.ListenTCP("127.0.0.1:0")
 
 	go func(server *Server) {
 		time.Sleep(100 * time.Millisecond)
 
-		serverAddr, _ := net.ResolveUDPAddr("udp", "localhost:5141")
+		serverAddr, _ := net.ResolveUDPAddr("udp", server.connections[0].LocalAddr().String())
 		con, _ := net.DialUDP("udp", nil, serverAddr)
 		con.Write([]byte(exampleSyslog))
 		time.Sleep(100 * time.Millisecond)
diff --git a/servertls_test.go b/servertls_test.go
index 45b2018..ddcdaaa 100644
--- a/servertls_test.go
+++ b/servertls_test.go
@@ -59,12 +59,12 @@ func (s *ServerSuite) TestTLS(c *C) {
 	server := NewServer()
 	server.SetFormat(RFC3164)
 	server.SetHandler(handler)
-	server.ListenTCPTLS("0.0.0.0:5143", getServerConfig())
+	server.ListenTCPTLS("127.0.0.1:0", getServerConfig())
 
 	server.Boot()
 	go func(server *Server) {
 		time.Sleep(100 * time.Millisecond)
-		conn, err := tls.Dial("tcp", "127.0.0.1:5143", getClientConfig())
+		conn, err := tls.Dial("tcp", server.listeners[0].Addr().String(), getClientConfig())
 		if err != nil {
 			panic(err)
 		}