diff --git a/package.json b/package.json
index d1e3868..f7218d9 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "wordpos",
-  "version": "2.0.0-beta.14",
+  "version": "2.0.0-beta.15",
   "description": "wordpos is a set of part-of-speech utilities for Node.js & browser using the WordNet database.",
   "author": "Moos <mooster@42at.com>",
   "keywords": [
diff --git a/src/browser/index.js b/src/browser/index.js
index c2f6cdc..f2cf51e 100644
--- a/src/browser/index.js
+++ b/src/browser/index.js
@@ -7,7 +7,7 @@
 * Released under MIT license
 */
 
-const { stopwords, prepText, makeStopwordString } = require('../util');
+const { stopwords, prepText, makeStopwordString, flat } = require('../util');
 const { is, get, getPOS, lookup, seek, lookupPOS } = require('../common');
 const { randX, rand } = require('../rand');
 const IndexFile = require('./indexFile');
@@ -69,7 +69,7 @@ class WordPOS {
     let promise = this._preload(this.indexFiles, pos);
     if (this.options.includeData) {
       promise = Promise.all([].concat(promise, this._preload(this.dataFiles, pos)))
-        .then(res => res.flat());
+        .then(res => flat(res));
     }
     return promise;
   }