diff --git a/fastapi/routing.py b/fastapi/routing.py
index 144879ea2..3bd0e33f4 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -48,6 +48,7 @@ from fastapi.dependencies.utils import (
 from fastapi.encoders import jsonable_encoder
 from fastapi.exceptions import (
     FastAPIError,
+    RequestMalformedError,
     RequestValidationError,
     ResponseValidationError,
     WebSocketRequestValidationError,
@@ -350,7 +351,7 @@ def get_request_handler(
                         else:
                             body = body_bytes
         except json.JSONDecodeError as e:
-            validation_error = RequestValidationError(
+            validation_error = RequestMalformedError(
                 [
                     {
                         "type": "json_invalid",