diff --git a/abcd/backends/atoms_opensearch.py b/abcd/backends/atoms_opensearch.py
index 36fcc996..eb51b91e 100644
--- a/abcd/backends/atoms_opensearch.py
+++ b/abcd/backends/atoms_opensearch.py
@@ -887,7 +887,7 @@ def rename_property(
         query = self.parser(query)
         logger.info("rename: query=%s, old=%s, new=%s", query, name, new_name)
 
-        script_txt = "if (!ctx._source.containsKey(params.new_name)) {{ "
+        script_txt = "if (!ctx._source.containsKey(params.new_name)) { "
         script_txt += (
             f"ctx._source.{new_name} = ctx._source.{name};"
             " ctx._source.remove(params.name);"