diff --git a/package-lock.json b/package-lock.json
index 03e13c91..db6fc25b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "cf-nodejs-logging-support",
-  "version": "8.1.0",
+  "version": "8.1.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cf-nodejs-logging-support",
-      "version": "8.1.0",
+      "version": "8.1.1",
       "license": "Apache-2.0",
       "dependencies": {
         "@opentelemetry/api": "^1.9.1",
diff --git a/package.json b/package.json
index edbbad04..7a2395bb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cf-nodejs-logging-support",
-  "version": "8.1.0",
+  "version": "8.1.1",
   "description": "Logging tool for Cloud Foundry",
   "keywords": [
     "logging",
diff --git a/src/lib/winston/winstonTransport.ts b/src/lib/winston/winstonTransport.ts
index da7d16b4..5cdd83eb 100644
--- a/src/lib/winston/winstonTransport.ts
+++ b/src/lib/winston/winstonTransport.ts
@@ -27,6 +27,6 @@ class CfNodejsLoggingSupportLogger extends TransportStream {
     }
 }
 
-export default function createTransport(options: any) {
+export default function createTransport(options: any): TransportStream {
     return new CfNodejsLoggingSupportLogger(options);
 }