diff --git a/api/libs/helper.py b/api/libs/helper.py
index a278ace6ad..abc81d1fde 100644
--- a/api/libs/helper.py
+++ b/api/libs/helper.py
@@ -215,7 +215,11 @@ def generate_text_hash(text: str) -> str:
 
 def compact_generate_response(response: Union[Mapping, Generator, RateLimitGenerator]) -> Response:
     if isinstance(response, dict):
-        return Response(response=json.dumps(jsonable_encoder(response)), status=200, mimetype="application/json")
+        return Response(
+            response=json.dumps(jsonable_encoder(response)),
+            status=200,
+            content_type="application/json; charset=utf-8",
+        )
     else:
 
         def generate() -> Generator: