diff --git a/test/Libraries/Microsoft.Extensions.AI.Integration.Tests/ChatClientIntegrationTests.cs b/test/Libraries/Microsoft.Extensions.AI.Integration.Tests/ChatClientIntegrationTests.cs
index 7b1dd10a2bd..349de2e771a 100644
--- a/test/Libraries/Microsoft.Extensions.AI.Integration.Tests/ChatClientIntegrationTests.cs
+++ b/test/Libraries/Microsoft.Extensions.AI.Integration.Tests/ChatClientIntegrationTests.cs
@@ -1157,13 +1157,14 @@ public virtual async Task SummarizingChatReducer_PreservesConversationContext()
         // The summarizer should have reduced the conversation
         Assert.Equal(1, chatClient.SummarizerCallCount);
         Assert.NotNull(chatClient.LastSummarizedConversation);
-        Assert.Equal(3, chatClient.LastSummarizedConversation.Count);
+        Assert.Equal(4, chatClient.LastSummarizedConversation.Count);
         Assert.Collection(chatClient.LastSummarizedConversation,
             m =>
             {
                 Assert.Equal(ChatRole.Assistant, m.Role); // Indicates this is the assistant's summary
                 Assert.Contains("Alice", m.Text);
             },
+            m => Assert.StartsWith("I hiked the section", m.Text, StringComparison.Ordinal),
             m => Assert.StartsWith("The Sierra Nevada section", m.Text, StringComparison.Ordinal),
             m => Assert.StartsWith("What's my name", m.Text, StringComparison.Ordinal));