diff --git a/src/class/hL7Client.ts b/src/class/hL7Client.ts
index f1f99ec..c4436f4 100644
--- a/src/class/hL7Client.ts
+++ b/src/class/hL7Client.ts
@@ -11,8 +11,8 @@ import Client, {
   Message,
   OutboundHandler
 } from 'node-hl7-client'
-import { AClients } from '../decorate'
-import { errors } from '../errors'
+import { AClients } from '../decorate.js'
+import { errors } from '../errors.js'
 
 export class HL7Client {
   /** @internal */
diff --git a/src/class/hL7Server.ts b/src/class/hL7Server.ts
index 655173d..ad2a4f2 100644
--- a/src/class/hL7Server.ts
+++ b/src/class/hL7Server.ts
@@ -1,6 +1,6 @@
 import Server, { HL7Inbound, InboundHandler, ListenerOptions } from 'node-hl7-server'
-import { AServers } from '../decorate'
-import { errors } from '../errors'
+import { AServers } from '../decorate.js'
+import { errors } from '../errors.js'
 
 export class HL7Server {
   private readonly _server: Server