diff --git a/openstack/objectstorage/v1/objects/requests.go b/openstack/objectstorage/v1/objects/requests.go
index c2fbaae..89e7b49 100644
--- a/openstack/objectstorage/v1/objects/requests.go
+++ b/openstack/objectstorage/v1/objects/requests.go
@@ -1,12 +1,13 @@
 package objects
 
 import (
-	"bytes"
+	"bufio"
 	"crypto/hmac"
 	"crypto/md5"
 	"crypto/sha1"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"strings"
 	"time"
 
@@ -213,19 +214,20 @@
 	}
 
 	hash := md5.New()
+	bufioReader := bufio.NewReader(io.TeeReader(content, hash))
+	io.Copy(ioutil.Discard, bufioReader)
+	localChecksum := hash.Sum(nil)
 
-	contentBuffer := bytes.NewBuffer([]byte{})
-	_, err := io.Copy(contentBuffer, io.TeeReader(content, hash))
+	h["ETag"] = fmt.Sprintf("%x", localChecksum)
+
+	_, err := content.Seek(0, 0)
 	if err != nil {
 		res.Err = err
 		return res
 	}
 
-	localChecksum := hash.Sum(nil)
-	h["ETag"] = fmt.Sprintf("%x", localChecksum)
-
 	ropts := gophercloud.RequestOpts{
-		RawBody:     strings.NewReader(contentBuffer.String()),
+		RawBody:     content,
 		MoreHeaders: h,
 	}