diff --git a/lib/mbtiles.js b/lib/mbtiles.js
index ab8c842..335c934 100644
--- a/lib/mbtiles.js
+++ b/lib/mbtiles.js
@@ -66,6 +66,10 @@ function MBTiles(uri, callback) {
     return undefined;
 }
 
+MBTiles.prototype.toString = function() {
+    return '[MBTiles ' + this.filename + ']';
+}
+
 MBTiles.prototype._open = function(uri) {
     var mbtiles = this;
     function error(err) {