diff --git a/src/routes/api/sender.ts b/src/routes/api/sender.ts
index 890eefa98..22eea766d 100644
--- a/src/routes/api/sender.ts
+++ b/src/routes/api/sender.ts
@@ -7,7 +7,7 @@ import sanitize_attribute_name from "../../services/sanitize_attribute_name.js";
 import specialNotesService from "../../services/special_notes.js";
 import { Request } from 'express';
 
-function uploadImage(req: Request) {
+async function uploadImage(req: Request) {
     const file = req.file;
 
     if (!file) {
@@ -24,7 +24,7 @@ function uploadImage(req: Request) {
         return [400, "Invalid image content type."];
     }
 
-    const uploadedImageType = imageType(file.buffer);
+    const uploadedImageType = await imageType(file.buffer);
     if (!uploadedImageType) {
         return [400, "Unable to determine image type."];
     }