diff --git a/src/typed_encoding.ts b/src/typed_encoding.ts
index 83ae541..d19a9d2 100644
--- a/src/typed_encoding.ts
+++ b/src/typed_encoding.ts
@@ -6,9 +6,9 @@ import {
     deserializeString,
     serializeString,
     nextUint8
-} from "./utils"
+} from "./utils.js"
 
-import VarInt from "./varint"
+import VarInt from "./varint.js"
 
 export default {
     serialize,
diff --git a/src/varint.ts b/src/varint.ts
index 4c86dee..4ee527c 100644
--- a/src/varint.ts
+++ b/src/varint.ts
@@ -1,4 +1,4 @@
-import { toByteArray, concatUint8Arrays, nextUint8, fromByteArray } from "./utils"
+import { toByteArray, concatUint8Arrays, nextUint8, fromByteArray } from "./utils.js"
 
 export default {
     serialize,