diff --git a/index.ts b/index.ts
index ceb0bd1..07fce3e 100644
--- a/index.ts
+++ b/index.ts
@@ -1,3 +1,3 @@
-export { default as pSignal } from './src/pSignal'
-export { default as AbortError } from './src/AbortError'
-export { default as isAbortError } from './src/isAbortError'
+export { default as pSignal } from './src/pSignal.js'
+export { default as AbortError } from './src/AbortError.js'
+export { default as isAbortError } from './src/isAbortError.js'
diff --git a/src/pSignal.ts b/src/pSignal.ts
index 2eeba5e..e05b803 100644
--- a/src/pSignal.ts
+++ b/src/pSignal.ts
@@ -1,4 +1,4 @@
-import AbortError from './AbortError'
+import AbortError from './AbortError.js'
 
 export default async function pSignal<T>(
     signal: AbortSignal | undefined,