diff --git a/lib/mbtiles.js b/lib/mbtiles.js
index 56b2076..d6cf95e 100644
--- a/lib/mbtiles.js
+++ b/lib/mbtiles.js
@@ -60,7 +60,10 @@ function MBTiles(uri, callback) {
 
     var mbtiles = cache[key];
     if (!mbtiles.open && !mbtiles.error) {
-        mbtiles.once('open', callback);
+        mbtiles.once('open', function(err, mbtiles) {
+            delete cache[key];
+            callback(err, mbtiles);
+        });
     } else {
         callback(mbtiles.error || null, mbtiles);
     }