diff --git a/src/stores/s3objects.ts b/src/stores/s3objects.ts
index f92f016b1e30e15e573cbc413f7c78300ab4e816..42a631d9fad0e70fc6398e0598bf93627066dc6b 100644
--- a/src/stores/s3objects.ts
+++ b/src/stores/s3objects.ts
@@ -297,7 +297,7 @@ export const useS3ObjectStore = defineStore({
       const command = new PutObjectCommand({
         Bucket: bucketName,
         Body: "",
-        ContentType: "text/plain",
+        ContentType: "application/octet-stream",
         Key: key,
       });
       return this.client.send(command).then(() => {