diff --git a/main.go b/main.go
index d04f4ee..d7042d4 100644
--- a/main.go
+++ b/main.go
@@ -376,7 +376,7 @@ func main() {
 		return nil
 	})
 
-	d := &ofsDriver{volumedb: db, defEnv: defEnv}
+	d := &ofsDriver{volumedb: db, volumeRt: make(map[string]*ofsVolumeRt), defEnv: defEnv}
 	h := volume.NewHandler(d)
 	u, _ := user.Lookup("root")
 	gid, _ := strconv.Atoi(u.Gid)