diff --git a/llm_server/llm/openai/oai_to_vllm.py b/llm_server/llm/openai/oai_to_vllm.py
index 34dd8aa..cf039de 100644
--- a/llm_server/llm/openai/oai_to_vllm.py
+++ b/llm_server/llm/openai/oai_to_vllm.py
@@ -6,6 +6,9 @@ from llm_server import opts
 def oai_to_vllm(request_json_body, hashes: bool, mode):
     if not request_json_body.get('stop'):
         request_json_body['stop'] = []
+    if not isinstance(request_json_body['stop'], list):
+        # It is a string, so create a list with the existing element
+        request_json_body['stop'] = [request_json_body['stop']]
 
     print(request_json_body['stop'])