diff --git a/Hcs.Broker/Client.cs b/Hcs.Broker/Client.cs
index 4dceafa..7af34f1 100644
--- a/Hcs.Broker/Client.cs
+++ b/Hcs.Broker/Client.cs
@@ -72,7 +72,7 @@ namespace Hcs.Broker
             using var store = new CpX509Store(StoreName.My, StoreLocation.CurrentUser);
             store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
 
-            var cert = store.Certificates.Find(X509FindType.FindBySerialNumber, serialNumber, true)[0];
+            var cert = store.Certificates.Find(X509FindType.FindBySerialNumber, serialNumber, false)[0];
             Certificate = cert ?? throw new ArgumentNullException("Certificate not found");
         }