diff --git a/src/Tinify/Client.cs b/src/Tinify/Client.cs
index eaa84f4..f9bc139 100755
--- a/src/Tinify/Client.cs
+++ b/src/Tinify/Client.cs
@@ -21,12 +21,14 @@ public class Client
 
         HttpClient client;
 
-        public Client(string key, string appIdentifier = null, string proxy = null)
+        public Client(string key, string appIdentifier = null, string proxy = null, bool validateServerCertificate = true)
         {
-            var handler = new HttpClientHandler()
+            var handler = new HttpClientHandler();
+
+            if (validateServerCertificate)
             {
-                ServerCertificateCustomValidationCallback = Internal.SSL.ValidationCallback
-            };
+                handler.ServerCertificateCustomValidationCallback = Internal.SSL.ValidationCallback;
+            }
 
             if (proxy != null)
             {