diff --git a/cmd/deletetree/main.go b/cmd/deletetree/main.go
index e5c9d75fd8..9f0e0f4924 100644
--- a/cmd/deletetree/main.go
+++ b/cmd/deletetree/main.go
@@ -32,6 +32,7 @@ import (
 var (
 	adminServerAddr = flag.String("admin_server", "", "Address of the gRPC Trillian Admin Server (host:port)")
 	logID           = flag.Int64("log_id", 0, "Trillian LogID to delete")
+	undeleteTree    = flag.Bool("undelete_tree", false, "Undelete the specified Trillian LogID (bool)")
 )
 
 func main() {
@@ -50,8 +51,15 @@ func main() {
 	defer conn.Close()
 
 	a := trillian.NewTrillianAdminClient(conn)
-	_, err = a.DeleteTree(context.Background(), &trillian.DeleteTreeRequest{TreeId: *logID})
-	if err != nil {
-		glog.Exitf("Delete failed: %v", err)
+	if !*undeleteTree {
+		_, err = a.DeleteTree(context.Background(), &trillian.DeleteTreeRequest{TreeId: *logID})
+		if err != nil {
+			glog.Exitf("Delete failed: %v", err)
+		}
+	} else {
+		_, err = a.UndeleteTree(context.Background(), &trillian.UndeleteTreeRequest{TreeId: *logID})
+		if err != nil {
+			glog.Exitf("Undelete failed: %v", err)
+		}
 	}
 }