diff --git a/src/PSProxmoxVE.Core/Client/PveHttpClient.cs b/src/PSProxmoxVE.Core/Client/PveHttpClient.cs
index 8672c2a..992ece9 100644
--- a/src/PSProxmoxVE.Core/Client/PveHttpClient.cs
+++ b/src/PSProxmoxVE.Core/Client/PveHttpClient.cs
@@ -280,7 +280,7 @@ namespace PSProxmoxVE.Core.Client
 
             if (_session.AuthMode == PveAuthMode.ApiToken)
             {
-                request.Headers.Add("Authorization", $"PVEAPIToken={_session.ApiToken}");
+                request.Headers.TryAddWithoutValidation("Authorization", $"PVEAPIToken={_session.ApiToken}");
             }
             else
             {