diff --git a/weed/command/filer.go b/weed/command/filer.go
index d7181f0a9..64d227b95 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -137,6 +137,7 @@ func init() {
 	filerS3Options.concurrentUploadLimitMB = cmdFiler.Flag.Int("s3.concurrentUploadLimitMB", 0, "limit total concurrent upload size for S3, 0 means unlimited")
 	filerS3Options.concurrentFileUploadLimit = cmdFiler.Flag.Int("s3.concurrentFileUploadLimit", 0, "limit number of concurrent file uploads for S3, 0 means unlimited")
 	filerS3Options.enableIam = cmdFiler.Flag.Bool("s3.iam", true, "enable embedded IAM API on the same S3 port")
+	filerS3Options.cipher = cmdFiler.Flag.Bool("s3.encryptVolumeData", false, "encrypt data on volume servers for S3 uploads")
 
 	// start webdav on filer
 	filerStartWebDav = cmdFiler.Flag.Bool("webdav", false, "whether to start webdav gateway")