diff --git a/weed/command/filer_replication.go b/weed/command/filer_replication.go
index 5e41cbb55..02b6f70eb 100644
--- a/weed/command/filer_replication.go
+++ b/weed/command/filer_replication.go
@@ -1,12 +1,16 @@
 package command
 
 import (
+	"strings"
+
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/replication"
 	"github.com/chrislusf/seaweedfs/weed/server"
 	"github.com/spf13/viper"
-	"strings"
 	"github.com/chrislusf/seaweedfs/weed/replication/sink"
+	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/s3sink"
+	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/filersink"
+	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/gcssink"
 )
 
 func init() {
@@ -72,6 +76,14 @@ func runFilerReplicate(cmd *Command, args []string) bool {
 		}
 	}
 
+	if dataSink == nil {
+		println("no data sink defined:")
+		for _, sk := range sink.Sinks {
+			println("    " + sk.GetName())
+		}
+		return true
+	}
+
 	replicator := replication.NewReplicator(config.Sub("source.filer"), dataSink)
 
 	for {