diff --git a/slo_generator/backends/elasticsearch.py b/slo_generator/backends/elasticsearch.py
index 97511913..50f6b346 100644
--- a/slo_generator/backends/elasticsearch.py
+++ b/slo_generator/backends/elasticsearch.py
@@ -161,7 +161,7 @@ def build_query(query, window, date_field=DEFAULT_DATE_FIELD):
         if "filter" in body["query"]["bool"]:
             body["query"]["bool"]["filter"]["range"] = range_query
         else:
-            body["query"]["bool"] = {"filter": {"range": range_query}}
+            body["query"]["bool"]["filter"] = {"range": range_query}
 
         return body