diff --git a/moto/moto_proxy/utils.py b/moto/moto_proxy/utils.py
index bcd7fe299..9a9669ac5 100644
--- a/moto/moto_proxy/utils.py
+++ b/moto/moto_proxy/utils.py
@@ -1,4 +1,3 @@
-import io
 from typing import Dict, Optional, Tuple
 
 import multipart
@@ -7,9 +6,8 @@ import multipart
 def get_body_from_form_data(
     body: bytes, boundary: str
 ) -> Tuple[Optional[bytes], Dict[str, str]]:
-    body_stream = io.BytesIO(body)
     parser = multipart.MultipartParser(boundary=boundary)
-    parser.write(body_stream)
+    parser.write(body)
     data = None
     headers: Dict[str, str] = {}
     for prt in parser.parts():