diff --git a/vllm/entrypoints/api_server.py b/vllm/entrypoints/api_server.py
index 3a0d05f48491e..77129e2dcf393 100644
--- a/vllm/entrypoints/api_server.py
+++ b/vllm/entrypoints/api_server.py
@@ -9,6 +9,7 @@
 import argparse
 import json
 import ssl
+from dataclasses import asdict
 from typing import AsyncGenerator
 
 import uvicorn
@@ -75,7 +76,8 @@ async def stream_results() -> AsyncGenerator[bytes, None]:
                 output.text for output in request_output.outputs
             ]
             output_tokens = [output.token_ids for output in request_output.outputs]
-            logprobs = [output.logprobs for output in request_output.outputs]
+            logprobs = [[{k: asdict(v) for k, v in logprobs.items()} for logprobs in
+                         output.logprobs] if output.logprobs is not None else None for output in request_output.outputs]
             ret = {"text": text_outputs, "output_token_ids": output_tokens, "logprobs": logprobs}
             yield (json.dumps(ret) + "\0").encode("utf-8")
 
@@ -94,7 +96,8 @@ async def stream_results() -> AsyncGenerator[bytes, None]:
     assert final_output is not None
     text_outputs = [output.text for output in final_output.outputs]
     output_tokens = [output.token_ids for output in final_output.outputs]
-    logprobs = [output.logprobs for output in final_output.outputs]
+    logprobs = [[{k: asdict(v) for k, v in logprobs.items()} for logprobs in
+                 output.logprobs] if output.logprobs is not None else None for output in final_output.outputs]
     ret = {"text": text_outputs, "output_token_ids": output_tokens, "logprobs": logprobs}
     return JSONResponse(ret)