diff --git a/src/main/java/org/recordy/server/record/service/impl/S3ServiceImpl.java b/src/main/java/org/recordy/server/record/service/impl/S3ServiceImpl.java
index d2916c0f..4578e7d6 100644
--- a/src/main/java/org/recordy/server/record/service/impl/S3ServiceImpl.java
+++ b/src/main/java/org/recordy/server/record/service/impl/S3ServiceImpl.java
@@ -26,7 +26,7 @@ public class S3ServiceImpl implements S3Service {
     public FileUrl generatePresignedUrl() {
         return new FileUrl(
                 generatePresignedUrl("videos/", ".mp4"),
-                generatePresignedUrl("thumbnails/", "")
+                generatePresignedUrl("thumbnails/", ".jpeg")
         );
     }