diff --git a/types/hexo-fs/hexo-fs-tests.ts b/types/hexo-fs/hexo-fs-tests.ts
index d53a790ac1..fbfb6cb53a 100644
--- a/types/hexo-fs/hexo-fs-tests.ts
+++ b/types/hexo-fs/hexo-fs-tests.ts
@@ -595,7 +595,7 @@ it('emptyDir() - callback', callback => {
                 join('folder', 'i.js')
             ]);
 
-            Promise.map([
+            const dataArray: Array<[string, boolean]> = [
                 [join(target, '.hidden', 'a.txt'), true],
                 [join(target, '.hidden', 'b.js'), true],
                 [join(target, '.hidden', 'c', 'd'), true],
@@ -605,7 +605,8 @@ it('emptyDir() - callback', callback => {
                 [join(target, 'folder', 'h.txt'), false],
                 [join(target, 'folder', 'i.js'), false],
                 [join(target, 'folder', '.j'), true]
-            ] as Array<[string, boolean]>, data => {
+            ];
+            Promise.map(dataArray, data => {
                 return fs.exists(data[0]).then(exist => {
                     exist.should.eql(data[1]);
                 });