diff --git a/s3tests/functional/test_s3.py b/s3tests/functional/test_s3.py
index 61c0871..55a04d4 100644
--- a/s3tests/functional/test_s3.py
+++ b/s3tests/functional/test_s3.py
@@ -5843,7 +5843,7 @@ def test_versioning_multi_object_delete_with_marker_create():
 
         keyname = 'key'
 
-        rmkeys = { bucket.new_key(keyname) }
+        rmkeys = [ bucket.new_key(keyname) ]
 
         eq(_count_bucket_versioned_objs(bucket), 0)