diff --git a/src/index.ts b/src/index.ts
index a292e08..f57f30f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,6 @@
-import LocalTimeElement from './local-time-element'
-import RelativeTimeElement from './relative-time-element'
-import TimeAgoElement from './time-ago-element'
-import TimeUntilElement from './time-until-element'
+import LocalTimeElement from './local-time-element.js'
+import RelativeTimeElement from './relative-time-element.js'
+import TimeAgoElement from './time-ago-element.js'
+import TimeUntilElement from './time-until-element.js'
 
 export {LocalTimeElement, RelativeTimeElement, TimeAgoElement, TimeUntilElement}