diff --git a/Source/MQTTnet.Extensions.WebSocket4Net/WebSocket4NetMqttChannel.cs b/Source/MQTTnet.Extensions.WebSocket4Net/WebSocket4NetMqttChannel.cs
index 68b12ef..47d9682 100644
--- a/Source/MQTTnet.Extensions.WebSocket4Net/WebSocket4NetMqttChannel.cs
+++ b/Source/MQTTnet.Extensions.WebSocket4Net/WebSocket4NetMqttChannel.cs
@@ -85,7 +85,12 @@ namespace MQTTnet.Extensions.WebSocket4Net
             {
                 foreach (var certificate in _webSocketOptions.TlsOptions.Certificates)
                 {
+#if WINDOWS_UWP
                     certificates.Add(new X509Certificate(certificate));
+#else
+                    certificates.Add(certificate);
+#endif
+                    
                 }
             }
 
diff --git a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
index 65a1ec9..4fd0ccf 100644
--- a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilder.cs
@@ -256,7 +256,11 @@ namespace MQTTnet.Client.Options
                         UseTls = true,
                         SslProtocol = _tlsParameters.SslProtocol,
                         AllowUntrustedCertificates = _tlsParameters.AllowUntrustedCertificates,
+#if WINDOWS_UWP
                         Certificates = _tlsParameters.Certificates?.Select(c => c.ToArray()).ToList(),
+#else
+                        Certificates = _tlsParameters.Certificates?.ToList(),
+#endif
                         CertificateValidationCallback = _tlsParameters.CertificateValidationCallback,
                         IgnoreCertificateChainErrors = _tlsParameters.IgnoreCertificateChainErrors,
                         IgnoreCertificateRevocationErrors = _tlsParameters.IgnoreCertificateRevocationErrors
diff --git a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs
index ea36baa..d1854ff 100644
--- a/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientOptionsBuilderTlsParameters.cs
@@ -18,7 +18,12 @@ namespace MQTTnet.Client.Options
 
         public SslProtocols SslProtocol { get; set; } = SslProtocols.Tls12;
 
+#if WINDOWS_UWP
         public IEnumerable<IEnumerable<byte>> Certificates { get; set; }
+#else
+        public IEnumerable<X509Certificate> Certificates { get; set; }
+#endif
+        
 
         public bool AllowUntrustedCertificates { get; set; }
 
diff --git a/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs b/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs
index db4077d..0d1a3a5 100644
--- a/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs
+++ b/Source/MQTTnet/Client/Options/MqttClientTlsOptions.cs
@@ -15,8 +15,11 @@ namespace MQTTnet.Client.Options
         public bool IgnoreCertificateChainErrors { get; set; }
 
         public bool AllowUntrustedCertificates { get; set; }
-
+#if WINDOWS_UWP
         public List<byte[]> Certificates { get; set; }
+#else
+        public List<X509Certificate> Certificates { get; set; }
+#endif
 
         public SslProtocols SslProtocol { get; set; } = SslProtocols.Tls12;
 
diff --git a/Source/MQTTnet/Implementations/MqttTcpChannel.cs b/Source/MQTTnet/Implementations/MqttTcpChannel.cs
index d7943ad..8f012cb 100644
--- a/Source/MQTTnet/Implementations/MqttTcpChannel.cs
+++ b/Source/MQTTnet/Implementations/MqttTcpChannel.cs
@@ -214,7 +214,7 @@ namespace MQTTnet.Implementations
 
             foreach (var certificate in _options.TlsOptions.Certificates)
             {
-                certificates.Add(new X509Certificate2(certificate));
+                certificates.Add(certificate);
             }
 
             return certificates;
diff --git a/Source/MQTTnet/Implementations/MqttWebSocketChannel.cs b/Source/MQTTnet/Implementations/MqttWebSocketChannel.cs
index 38e4342..db53936 100644
--- a/Source/MQTTnet/Implementations/MqttWebSocketChannel.cs
+++ b/Source/MQTTnet/Implementations/MqttWebSocketChannel.cs
@@ -84,7 +84,12 @@ namespace MQTTnet.Implementations
                 clientWebSocket.Options.ClientCertificates = new X509CertificateCollection();
                 foreach (var certificate in _options.TlsOptions.Certificates)
                 {
+#if WINDOWS_UWP
                     clientWebSocket.Options.ClientCertificates.Add(new X509Certificate(certificate));
+#else
+                    clientWebSocket.Options.ClientCertificates.Add(certificate);
+#endif
+                    
                 }
             }