diff --git a/tests/entrypoints/test_openai_server.py b/tests/entrypoints/test_openai_server.py
index a2a98abe..1323dba4 100644
--- a/tests/entrypoints/test_openai_server.py
+++ b/tests/entrypoints/test_openai_server.py
@@ -13,6 +13,7 @@ import pytest
 # and debugging.
 import ray
 import requests
+import torch
 # downloading lora to test lora requests
 from huggingface_hub import snapshot_download
 from openai import BadRequestError
@@ -870,5 +871,24 @@ async def test_echo_logprob_completion(server, client: openai.AsyncOpenAI,
         assert len(logprobs.tokens) > 5
 
 
+async def test_long_seed(server, client: openai.AsyncOpenAI):
+    for seed in [
+            torch.iinfo(torch.long).min - 1,
+            torch.iinfo(torch.long).max + 1
+    ]:
+        with pytest.raises(BadRequestError) as exc_info:
+            await client.chat.completions.create(
+                model=MODEL_NAME,
+                messages=[{
+                    "role": "system",
+                    "content": "You are a helpful assistant.",
+                }],
+                temperature=0,
+                seed=seed)
+
+        assert ("greater_than_equal" in exc_info.value.message
+                or "less_than_equal" in exc_info.value.message)
+
+
 if __name__ == "__main__":
     pytest.main([__file__])
diff --git a/vllm/entrypoints/openai/protocol.py b/vllm/entrypoints/openai/protocol.py
index 731596e8..3cd9ddad 100644
--- a/vllm/entrypoints/openai/protocol.py
+++ b/vllm/entrypoints/openai/protocol.py
@@ -79,7 +79,9 @@ class ChatCompletionRequest(OpenAIBaseModel):
     n: Optional[int] = 1
     presence_penalty: Optional[float] = 0.0
     response_format: Optional[ResponseFormat] = None
-    seed: Optional[int] = None
+    seed: Optional[int] = Field(None,
+                                ge=torch.iinfo(torch.long).min,
+                                le=torch.iinfo(torch.long).max)
     stop: Optional[Union[str, List[str]]] = Field(default_factory=list)
     stream: Optional[bool] = False
     temperature: Optional[float] = 0.7
@@ -228,7 +230,9 @@ class CompletionRequest(OpenAIBaseModel):
     max_tokens: Optional[int] = 16
     n: int = 1
     presence_penalty: Optional[float] = 0.0
-    seed: Optional[int] = None
+    seed: Optional[int] = Field(None,
+                                ge=torch.iinfo(torch.long).min,
+                                le=torch.iinfo(torch.long).max)
     stop: Optional[Union[str, List[str]]] = Field(default_factory=list)
     stream: Optional[bool] = False
     suffix: Optional[str] = None