diff --git a/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionFixture.cs b/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionFixture.cs
index 466abf3854..af98629237 100644
--- a/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionFixture.cs
+++ b/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicChatCompletionFixture.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft. All rights reserved.
+// Copyright (c) Microsoft. All rights reserved.
 
 using System;
 using System.Collections.Generic;
diff --git a/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicSkillsIntegrationTests.cs b/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicSkillsIntegrationTests.cs
index d171b23ad9..452b0c6cf2 100644
--- a/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicSkillsIntegrationTests.cs
+++ b/dotnet/tests/AnthropicChatCompletion.IntegrationTests/AnthropicSkillsIntegrationTests.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft. All rights reserved.
+// Copyright (c) Microsoft. All rights reserved.
 
 using System.Threading.Tasks;
 using AgentConformance.IntegrationTests.Support;
diff --git a/dotnet/tests/CopilotStudio.IntegrationTests/CopilotStudioFixture.cs b/dotnet/tests/CopilotStudio.IntegrationTests/CopilotStudioFixture.cs
index 567d41a552..c8db0c77d7 100644
--- a/dotnet/tests/CopilotStudio.IntegrationTests/CopilotStudioFixture.cs
+++ b/dotnet/tests/CopilotStudio.IntegrationTests/CopilotStudioFixture.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft. All rights reserved.
+// Copyright (c) Microsoft. All rights reserved.
 
 using System;
 using System.Collections.Generic;