diff --git a/pkg/common/db/s3/cos/cos.go b/pkg/common/db/s3/cos/cos.go
index 365f6b153..d355b2f0b 100644
--- a/pkg/common/db/s3/cos/cos.go
+++ b/pkg/common/db/s3/cos/cos.go
@@ -186,7 +186,7 @@ func (c *Cos) CopyObject(ctx context.Context, src string, dst string) (*s3.CopyO
 	}
 	return &s3.CopyObjectInfo{
 		Key:  dst,
-		ETag: strings.ReplaceAll(result.ETag, `""`, ""),
+		ETag: strings.ReplaceAll(result.ETag, `"`, ``),
 	}, nil
 }