diff --git a/FastGithub.HttpServer/CertService.cs b/FastGithub.HttpServer/CertService.cs
index b24f750..7aa2c66 100644
--- a/FastGithub.HttpServer/CertService.cs
+++ b/FastGithub.HttpServer/CertService.cs
@@ -148,6 +148,7 @@ namespace FastGithub.HttpServer
 
             yield return Environment.MachineName;
             yield return IPAddress.Loopback.ToString();
+            yield return IPAddress.IPv6Loopback.ToString();
         }
     }
 }