diff --git a/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs b/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs
index 72f1980b1c..4c0ff1a36d 100644
--- a/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Abstractions/DelegatingAIAgent.cs
@@ -25,7 +25,7 @@ namespace Microsoft.Agents.AI;
 /// Derived classes can override specific methods to add custom behavior while maintaining compatibility with the agent interface.
 /// </para>
 /// </remarks>
-public class DelegatingAIAgent : AIAgent
+public abstract class DelegatingAIAgent : AIAgent
 {
     /// <summary>
     /// Initializes a new instance of the <see cref="DelegatingAIAgent"/> class with the specified inner agent.