diff --git a/lib/activitypub/utils/verifySignature.js b/lib/activitypub/utils/verifySignature.js
index 38ec1b3..c5fa5b6 100644
--- a/lib/activitypub/utils/verifySignature.js
+++ b/lib/activitypub/utils/verifySignature.js
@@ -1,4 +1,4 @@
-function verifySignature(signature:any, publicKeyJson:any) {
+function verifySignature(signature, publicKeyJson) {
   let signatureValid;
 
   try {
@@ -12,3 +12,5 @@ function verifySignature(signature:any, publicKeyJson:any) {
 
   return signatureValid;
 }
+
+module.exports = { verifySignature };