diff --git a/lib/gridfs.js b/lib/gridfs.js
index 1247270a..04a1e9f6 100644
--- a/lib/gridfs.js
+++ b/lib/gridfs.js
@@ -113,7 +113,7 @@ class GridFSStorage extends EventEmitter {
 			.then(({db, client}) => {
 				this._setDb(db, client);
 			})
-			.catch(error => this._fail(error));
+			.catch((error) => this._fail(error));
 	}
 
 	/**
diff --git a/test/utils/testutils.js b/test/utils/testutils.js
index 50984b7b..f577228e 100644
--- a/test/utils/testutils.js
+++ b/test/utils/testutils.js
@@ -7,7 +7,7 @@ import delay from 'delay';
 import {version} from 'mongodb/package.json';
 import {connection, storageOptions} from './settings';
 
-export const mongoVersion = version.split('.').map(Number);
+export const mongoVersion = version.split('.').map((v) => Number(v));
 
 export const files = ['sample1.jpg', 'sample2.jpg'].map((file) =>
 	path.join(__dirname, '/../attachments/', file)