diff --git a/sw_scripts/safari-notifications.js b/sw_scripts/safari-notifications.js
index 37a003c46..5ba7e06a9 100644
--- a/sw_scripts/safari-notifications.js
+++ b/sw_scripts/safari-notifications.js
@@ -566,7 +566,7 @@ async function getNotificationCount() {
   return result;
 }
 
-export async function blobToBase64String(blob) {
+async function blobToBase64String(blob) {
   return new Promise((resolve, reject) => {
     const reader = new FileReader();
     reader.onloadend = () => resolve(reader.result); // potential problem if it returns an ArrayBuffer?