diff --git a/src/esm/ecpair.js b/src/esm/ecpair.js
index 1eb5751..dfcaa18 100644
--- a/src/esm/ecpair.js
+++ b/src/esm/ecpair.js
@@ -1,7 +1,7 @@
-import * as networks from './networks';
-import * as types from './types';
+import * as networks from './networks.js';
+import * as types from './types.js';
 import * as wif from 'wif';
-import { testEcc } from './testecc';
+import { testEcc } from './testecc.js';
 export { networks };
 import * as v from 'valibot';
 import * as tools from 'uint8array-tools';
diff --git a/src/esm/index.js b/src/esm/index.js
index ad66e7b..d0e793d 100644
--- a/src/esm/index.js
+++ b/src/esm/index.js
@@ -1 +1 @@
-export { ECPairFactory as default, ECPairFactory, networks } from './ecpair';
+export { ECPairFactory as default, ECPairFactory, networks } from './ecpair.js';