diff --git a/dotnet/src/Microsoft.Extensions.AI.Agents.Abstractions/Agent.cs b/dotnet/src/Microsoft.Extensions.AI.Agents.Abstractions/Agent.cs
index 611d983be2..89f51cc683 100644
--- a/dotnet/src/Microsoft.Extensions.AI.Agents.Abstractions/Agent.cs
+++ b/dotnet/src/Microsoft.Extensions.AI.Agents.Abstractions/Agent.cs
@@ -203,7 +203,7 @@ public abstract class Agent
 
         if (thread is not TThreadType concreteThreadType)
         {
-            throw new NotSupportedException($"{this.GetType().Name} currently only supports agent threads of type {nameof(TThreadType)}.");
+            throw new NotSupportedException($"{this.GetType().Name} currently only supports agent threads of type {typeof(TThreadType).Name}.");
         }
 
         return concreteThreadType;