diff --git a/graphrag/query/structured_search/global_search/search.py b/graphrag/query/structured_search/global_search/search.py
index b7f75a43ee..12c31bf4ad 100644
--- a/graphrag/query/structured_search/global_search/search.py
+++ b/graphrag/query/structured_search/global_search/search.py
@@ -371,7 +371,7 @@ async def _reduce_response(
             text_data = "\n\n".join(data)
 
             search_prompt = self.reduce_system_prompt.format(
-                report_data=text_data, response_type=self.response_type
+                report_data=text_data, response_type=self.response_type, max_length=self.reduce_max_length
             )
             if self.allow_general_knowledge:
                 search_prompt += "\n" + self.general_knowledge_inclusion_prompt