diff --git a/fastapi/responses.py b/fastapi/responses.py
index 88dba96e8..c0a13b755 100644
--- a/fastapi/responses.py
+++ b/fastapi/responses.py
@@ -27,8 +27,6 @@ class UJSONResponse(JSONResponse):
 
 
 class ORJSONResponse(JSONResponse):
-    media_type = "application/json"
-
     def render(self, content: Any) -> bytes:
         assert orjson is not None, "orjson must be installed to use ORJSONResponse"
         return orjson.dumps(