diff --git a/Source/MQTTnet/Server/MqttServerOptionsBuilder.cs b/Source/MQTTnet/Server/MqttServerOptionsBuilder.cs
index ae0ae2d..05102a5 100644
--- a/Source/MQTTnet/Server/MqttServerOptionsBuilder.cs
+++ b/Source/MQTTnet/Server/MqttServerOptionsBuilder.cs
@@ -90,11 +90,13 @@ namespace MQTTnet.Server
             return this;
         }
 
+#if !WINDOWS_UWP
         public MqttServerOptionsBuilder WithEncryptionCertificate(X509Certificate2 certificate)
         {
             _options.TlsEndpointOptions.X509Certificate = certificate;
             return this;
         }
+#endif
 
         public MqttServerOptionsBuilder WithEncryptionSslProtocol(SslProtocols value)
         {
diff --git a/Source/MQTTnet/Server/MqttServerTlsTcpEndpointOptions.cs b/Source/MQTTnet/Server/MqttServerTlsTcpEndpointOptions.cs
index 02da53b..f0b5416 100644
--- a/Source/MQTTnet/Server/MqttServerTlsTcpEndpointOptions.cs
+++ b/Source/MQTTnet/Server/MqttServerTlsTcpEndpointOptions.cs
@@ -13,7 +13,9 @@ namespace MQTTnet.Server
 
         public byte[] Certificate { get; set; }
 
+#if !WINDOWS_UWP
         public X509Certificate2 X509Certificate { get; set; }
+#endif
 
         public IMqttServerCertificateCredentials CertificateCredentials { get; set; }