diff --git a/Lib/http/client.py b/Lib/http/client.py
index 91074129225..230bccec988 100644
--- a/Lib/http/client.py
+++ b/Lib/http/client.py
@@ -1060,7 +1060,7 @@ class HTTPConnection:
 
                 if encode_chunked and self._http_vsn == 11:
                     # chunked encoding
-                    chunk = f'{len(chunk):X}\r\n'.encode('ascii') + chunk \
+                    chunk = f'{len(chunk):X}''\r\n'.encode('ascii') + chunk \
                         + b'\r\n'
                 self.send(chunk)