diff --git a/abcd/backends/atoms_opensearch.py b/abcd/backends/atoms_opensearch.py
index e4ef72bf..9a795cee 100644
--- a/abcd/backends/atoms_opensearch.py
+++ b/abcd/backends/atoms_opensearch.py
@@ -966,7 +966,7 @@ def hist(
         query = self.parser(query)
         logger.info("parsed query: %s", query)
 
-        data = self.property(name, query)
+        data = self.property(name, query=query)
         return utils.histogram(name, data, **kwargs)
 
     def __repr__(self):