diff --git a/backend/db/avatars.go b/backend/db/avatars.go
index f90f5d4..27e41e7 100644
--- a/backend/db/avatars.go
+++ b/backend/db/avatars.go
@@ -81,14 +81,16 @@ func (db *DB) WriteUserAvatar(ctx context.Context,
 	hash = hex.EncodeToString(hasher.Sum(nil))
 
 	_, err = db.minio.PutObject(ctx, db.minioBucket, "/users/"+userID.String()+"/"+hash+".webp", webp, -1, minio.PutObjectOptions{
-		ContentType: "image/webp",
+		ContentType:    "image/webp",
+		SendContentMd5: true,
 	})
 	if err != nil {
 		return "", errors.Wrap(err, "uploading webp avatar")
 	}
 
 	_, err = db.minio.PutObject(ctx, db.minioBucket, "/users/"+userID.String()+"/"+hash+".jpg", jpeg, -1, minio.PutObjectOptions{
-		ContentType: "image/jpeg",
+		ContentType:    "image/jpeg",
+		SendContentMd5: true,
 	})
 	if err != nil {
 		return "", errors.Wrap(err, "uploading jpeg avatar")
@@ -110,14 +112,16 @@ func (db *DB) WriteMemberAvatar(ctx context.Context,
 	hash = hex.EncodeToString(hasher.Sum(nil))
 
 	_, err = db.minio.PutObject(ctx, db.minioBucket, "/members/"+memberID.String()+"/"+hash+".webp", webp, -1, minio.PutObjectOptions{
-		ContentType: "image/webp",
+		ContentType:    "image/webp",
+		SendContentMd5: true,
 	})
 	if err != nil {
 		return "", errors.Wrap(err, "uploading webp avatar")
 	}
 
 	_, err = db.minio.PutObject(ctx, db.minioBucket, "/members/"+memberID.String()+"/"+hash+".jpg", jpeg, -1, minio.PutObjectOptions{
-		ContentType: "image/jpeg",
+		ContentType:    "image/jpeg",
+		SendContentMd5: true,
 	})
 	if err != nil {
 		return "", errors.Wrap(err, "uploading jpeg avatar")
diff --git a/backend/db/export.go b/backend/db/export.go
index 5c35552..7741a8d 100644
--- a/backend/db/export.go
+++ b/backend/db/export.go
@@ -67,7 +67,8 @@ func (db *DB) CreateExport(ctx context.Context, userID xid.ID, filename string,
 	}
 
 	_, err = db.minio.PutObject(ctx, db.minioBucket, de.Path(), file, int64(file.Len()), minio.PutObjectOptions{
-		ContentType: "application/zip",
+		ContentType:    "application/zip",
+		SendContentMd5: true,
 	})
 	if err != nil {
 		return de, errors.Wrap(err, "writing export file")