diff --git a/libs/ktem/ktem/index/file/knet/pipelines.py b/libs/ktem/ktem/index/file/knet/pipelines.py
index 2820d372..70017089 100644
--- a/libs/ktem/ktem/index/file/knet/pipelines.py
+++ b/libs/ktem/ktem/index/file/knet/pipelines.py
@@ -88,7 +88,7 @@ class KnetRetrievalPipeline(BaseFileIndexRetriever):
             "assert_query_type": self.pipeline_name,
             "retrieval_expansion": self.retrieval_expansion,
             "user_id": self.user_id,
-            "lang": lang,
+            "language": lang,
         }
         print(params)
         params["meta_filters"] = json.dumps(params["meta_filters"])