diff --git a/packages/crdt/src/builtins/2PSet/index.ts b/packages/crdt/src/builtins/2PSet/index.ts
index e3ced04d..ca566195 100644
--- a/packages/crdt/src/builtins/2PSet/index.ts
+++ b/packages/crdt/src/builtins/2PSet/index.ts
@@ -1,4 +1,4 @@
-import { GSet } from "../GSet";
+import { GSet } from "../GSet/index.js";
 
 /// 2PSet with support for state and op changes
 export class TwoPSet<T> {
diff --git a/packages/crdt/src/builtins/PNCounter/index.ts b/packages/crdt/src/builtins/PNCounter/index.ts
index 36b1a7ee..7ad3a0d7 100644
--- a/packages/crdt/src/builtins/PNCounter/index.ts
+++ b/packages/crdt/src/builtins/PNCounter/index.ts
@@ -1,4 +1,4 @@
-import { GCounter } from "../GCounter";
+import { GCounter } from "../GCounter/index.js";
 
 /// State-based PNCounter
 export class PNCounter {
diff --git a/packages/crdt/src/index.ts b/packages/crdt/src/index.ts
index af091e56..1badb84a 100644
--- a/packages/crdt/src/index.ts
+++ b/packages/crdt/src/index.ts
@@ -1,5 +1,5 @@
 // TODO dumb export logic, fix this
-export { IGCounter, GCounter } from "./builtins/GCounter";
-export { PNCounter } from "./builtins/PNCounter";
-export { GSet } from "./builtins/GSet";
-export { TwoPSet } from "./builtins/2PSet";
+export { IGCounter, GCounter } from "./builtins/GCounter/index.js";
+export { PNCounter } from "./builtins/PNCounter/index.js";
+export { GSet } from "./builtins/GSet/index.js";
+export { TwoPSet } from "./builtins/2PSet/index.js";