diff --git a/weed/command/filer.go b/weed/command/filer.go
index a3008eb29..146840e00 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -74,6 +74,7 @@ func init() {
 	filerS3Options.tlsPrivateKey = cmdFiler.Flag.String("s3.key.file", "", "path to the TLS private key file")
 	filerS3Options.tlsCertificate = cmdFiler.Flag.String("s3.cert.file", "", "path to the TLS certificate file")
 	filerS3Options.config = cmdFiler.Flag.String("s3.config", "", "path to the config file")
+	filerS3Options.allowEmptyFolder = cmdFiler.Flag.Bool("s3.allowEmptyFolder", false, "allow empty folders")
 }
 
 var cmdFiler = &Command{
diff --git a/weed/command/server.go b/weed/command/server.go
index 7e63f8e8a..bd25f94b1 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -113,6 +113,7 @@ func init() {
 	s3Options.tlsPrivateKey = cmdServer.Flag.String("s3.key.file", "", "path to the TLS private key file")
 	s3Options.tlsCertificate = cmdServer.Flag.String("s3.cert.file", "", "path to the TLS certificate file")
 	s3Options.config = cmdServer.Flag.String("s3.config", "", "path to the config file")
+	s3Options.allowEmptyFolder = cmdServer.Flag.Bool("s3.allowEmptyFolder", false, "allow empty folders")
 
 	msgBrokerOptions.port = cmdServer.Flag.Int("msgBroker.port", 17777, "broker gRPC listen port")