diff --git a/backends/s3/s3.go b/backends/s3/s3.go
index 58ccd14..17f6725 100644
--- a/backends/s3/s3.go
+++ b/backends/s3/s3.go
@@ -3,6 +3,7 @@ package s3
 import (
 	"io"
 	"io/ioutil"
+	"log"
 	"net/http"
 	"os"
 	"strconv"
@@ -156,6 +157,21 @@ func unmapMetadata(input map[string]*string) (m backends.Metadata, err error) {
 	return
 }
 
+func (b S3Backend) Lock(filename string) (err error) {
+	log.Printf("Locking is not supported on S3")
+	return
+}
+
+func (b S3Backend) Unlock(filename string) (err error) {
+	log.Printf("Locking is not supported on S3")
+	return
+}
+
+func (b S3Backend) CheckLock(filename string) (locked bool, err error) {
+	log.Printf("Locking is not supported on S3")
+	return
+}
+
 func (b S3Backend) Put(key string, r io.Reader, expiry time.Time, deleteKey, accessKey string, srcIp string) (m backends.Metadata, err error) {
 	tmpDst, err := ioutil.TempFile("", "linx-server-upload")
 	if err != nil {