diff --git a/sdk/openai/Azure.AI.OpenAI/src/Custom/StreamingChatCompletions.cs b/sdk/openai/Azure.AI.OpenAI/src/Custom/StreamingChatCompletions.cs
index 71dd993e240d..824a4bd8a0ec 100644
--- a/sdk/openai/Azure.AI.OpenAI/src/Custom/StreamingChatCompletions.cs
+++ b/sdk/openai/Azure.AI.OpenAI/src/Custom/StreamingChatCompletions.cs
@@ -177,6 +177,7 @@ internal StreamingChatCompletions(
             ChatCompletions baseChatCompletions = null,
             List<StreamingChatChoice> streamingChatChoices = null)
         {
+            _baseChatCompletions = new List<ChatCompletions>();
             _baseChatCompletions.Add(baseChatCompletions);
             _streamingChatChoices = streamingChatChoices;
             _streamingTaskComplete = true;