diff --git a/src/index.js b/src/index.js
index 79d4be8..a854dcf 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,2 +1,2 @@
-export * from './mock';
-export * from './test';
+export * from './mock.js';
+export * from './test.js';
diff --git a/test/src/inplacesort.js b/test/src/inplacesort.js
index 393a66e..4b35d0b 100644
--- a/test/src/inplacesort.js
+++ b/test/src/inplacesort.js
@@ -1,6 +1,6 @@
 // eslint-disable-next-line ava/use-test
 import ava from 'ava';
-import * as spec from '../../src';
+import * as spec from '../../src/index.js';
 
 spec.test(ava, [['mock', spec.mock]]);