diff --git a/packages/did-provider-ion/src/functions.ts b/packages/did-provider-ion/src/functions.ts
index a98fcb45d..f9de14895 100644
--- a/packages/did-provider-ion/src/functions.ts
+++ b/packages/did-provider-ion/src/functions.ts
@@ -13,7 +13,7 @@ import { randomBytes } from '@ethersproject/random'
 import * as u8a from 'uint8arrays'
 import { generateKeyPair as generateSigningKeyPair } from '@stablelib/ed25519'
 import Debug from 'debug'
-import { JsonCanonicalizer } from './json-canonicalizer'
+import { JsonCanonicalizer } from './json-canonicalizer.js'
 import { MemoryPrivateKeyStore } from '@veramo/key-manager'
 import { KeyManagementSystem } from '@veramo/kms-local'
 import { hash } from '@stablelib/sha256'