diff --git a/index.js b/index.js
index 31349f2..cc9c64f 100644
--- a/index.js
+++ b/index.js
@@ -4,9 +4,9 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-import BrowserPageOpener from './lib/browser'
-import JsdomPageOpener from './lib/jsdom'
-import { OpenedPage } from './lib/types'
+import BrowserPageOpener from './lib/browser.js'
+import JsdomPageOpener from './lib/jsdom.js'
+import { OpenedPage } from './lib/types.js'
 
 /**
  * Enables tests to open an application's own page URLs both in the browser and
diff --git a/lib/browser.js b/lib/browser.js
index 2ed2557..86a9226 100644
--- a/lib/browser.js
+++ b/lib/browser.js
@@ -6,7 +6,7 @@
  */
 
 import { createCoverageMap } from 'istanbul-lib-coverage'
-import { OpenedPage } from './types'
+import { OpenedPage } from './types.js'
 
 /**
  * Returns the window and document from a browser-opened HTML file.
diff --git a/lib/jsdom.js b/lib/jsdom.js
index d5a2ca5..b503967 100644
--- a/lib/jsdom.js
+++ b/lib/jsdom.js
@@ -5,7 +5,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-import { OpenedPage } from './types'
+import { OpenedPage } from './types.js'
 
 /**
  * Returns window and document objects from a jsdom-parsed HTML file.
diff --git a/package.json b/package.json
index 4b57092..5ebb767 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "test-page-opener",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "Enables an application's tests to open its own page URLs both in the browser and in Node.js using jsdom",
   "main": "index.js",
   "scripts": {