diff --git a/lib/db/ldb.js b/lib/db/ldb.js
index d22bcf56..35863b1b 100644
--- a/lib/db/ldb.js
+++ b/lib/db/ldb.js
@@ -42,14 +42,14 @@ function ldb(options) {
     cacheSize: options.cacheSize || (8 << 20),
     writeBufferSize: options.writeBufferSize || (4 << 20),
     maxOpenFiles: options.maxOpenFiles || 64,
-    filterBits: 0,
     paranoidChecks: false,
     memory: false,
 
     // For LMDB if we decide to use it:
     sync: options.sync || false,
-    mapSize: options.mapSize || 300 * (1024 << 20),
+    mapSize: options.mapSize || 2 * (1024 << 20),
     writeMap: options.writeMap || false,
+    noSubdir: options.noSubdir !== false,
 
     // For browser buffer keys
     bufferKeys: options.bufferKeys,
@@ -83,7 +83,7 @@ ldb.getBackend = function getBackend(db) {
       break;
     case 'lmdb':
       name = 'lmdb';
-      ext = 'lmdb';
+      ext = 'mdb';
       break;
     case 'memory':
     case 'rbt':