diff --git a/packages/core/streams/openai-stream.ts b/packages/core/streams/openai-stream.ts
index cd8acdd5f8b8..f252df66b340 100644
--- a/packages/core/streams/openai-stream.ts
+++ b/packages/core/streams/openai-stream.ts
@@ -656,6 +656,7 @@ function createFunctionCallTransformer(
                 ? textEncoder.encode(formatStreamPart('text', functionResponse))
                 : textEncoder.encode(functionResponse),
             );
+            aggregatedFinalCompletionResponse = functionResponse;
             return;
           }