diff --git a/tests/unit/remote/test_s3.py b/tests/unit/remote/test_s3.py
index 7861fb5a9a..36b9d1e236 100644
--- a/tests/unit/remote/test_s3.py
+++ b/tests/unit/remote/test_s3.py
@@ -83,3 +83,20 @@ def test_walk_files(remote):
     ]
 
     assert list(remote.walk_files(remote.path_info / "data")) == files
+
+
+def test_copy_preserve_etag_across_buckets(remote):
+    s3 = remote.s3
+    s3.create_bucket(Bucket="another")
+
+    another = RemoteS3(None, {"url": "s3://another", "region": "us-east-1"})
+
+    from_info = remote.path_info / "foo"
+    to_info = another.path_info / "foo"
+
+    remote.copy(from_info, to_info)
+
+    from_etag = RemoteS3.get_etag(s3, "bucket", "foo")
+    to_etag = RemoteS3.get_etag(s3, "another", "foo")
+
+    assert from_etag == to_etag