diff --git a/vllm/config.py b/vllm/config.py
index e8462421b73fc..0540dc4170584 100644
--- a/vllm/config.py
+++ b/vllm/config.py
@@ -421,7 +421,7 @@ def _verify_bnb_config(self) -> None:
             self.enforce_eager = True
 
     def get_pooling_type(self,
-                         pooling_type_name: str) -> Optional[PoolingType]:
+                         pooling_type_name: str) -> Union[PoolingType, None]:
         pooling_types = {i.name: i for i in PoolingType}
         return pooling_types.get(pooling_type_name)
 
@@ -433,8 +433,8 @@ def get_pooling_config(
             pooling_type = self.get_pooling_type(
                 pooling_config["pooling_type"])
             normalize = pooling_config["normalize"]
-            pooling_config = PoolingConfig(
-                pooling_type=PoolingType(pooling_type), normalize=normalize)
+            pooling_config = PoolingConfig(pooling_type=pooling_type,
+                                           normalize=normalize)
             if pooling_type_arg is not None:
                 pooling_config.pooling_type = self.get_pooling_type(
                     pooling_type_arg)