diff --git a/gunicorn/http/wsgi.py b/gunicorn/http/wsgi.py
index 0fcff5a2..5d91706c 100644
--- a/gunicorn/http/wsgi.py
+++ b/gunicorn/http/wsgi.py
@@ -372,7 +372,7 @@ class Response(object):
             chunk_size = "%X\r\n" % nbytes
             self.sock.sendall(chunk_size.encode('utf-8'))
         if nbytes > 0:
-            self.sock.sendfile(respiter.filelike, count=nbytes)
+            self.sock.sendfile(respiter.filelike, offset=offset, count=nbytes)
 
         if self.is_chunked():
             self.sock.sendall(b"\r\n")