diff --git a/listen_test.go b/listen_test.go
index 3d151ed931..ed102b7853 100644
--- a/listen_test.go
+++ b/listen_test.go
@@ -236,7 +236,7 @@ func Test_Listen_Acme_TLS_Prefork(t *testing.T) {
 	app := New()
 
 	// invalid port
-	require.Error(t, app.Listen(":0", ListenConfig{
+	require.Error(t, app.Listen(":99999", ListenConfig{
 		DisableStartupMessage: true,
 		EnablePrefork:         true,
 		AutoCertManager:       m,
@@ -247,7 +247,7 @@ func Test_Listen_Acme_TLS_Prefork(t *testing.T) {
 		assert.NoError(t, app.Shutdown())
 	}()
 
-	require.NoError(t, app.Listen(":99999", ListenConfig{
+	require.NoError(t, app.Listen(":0", ListenConfig{
 		DisableStartupMessage: true,
 		EnablePrefork:         true,
 		AutoCertManager:       m,