diff --git a/src/git-repository-async.js b/src/git-repository-async.js
index e45c1e47e..373ee44bc 100644
--- a/src/git-repository-async.js
+++ b/src/git-repository-async.js
@@ -305,7 +305,7 @@ export default class GitRepositoryAsync {
       .then(relativePath => {
         return this.repoPool.enqueue(() => {
           return this.getRepo()
-            .then(repo => repo.openIndex())
+            .then(repo => repo.index())
             .then(index => {
               const entry = index.getByPath(relativePath)
               if (!entry) return false