diff --git a/config/retriex/model.yaml b/config/retriex/model.yaml
index c68dd44..21c2681 100644
--- a/config/retriex/model.yaml
+++ b/config/retriex/model.yaml
@@ -22,6 +22,6 @@ parameters:
   # Optional model override per existing LLM call.
   # null or an empty value keeps the active default model from ModelGenerationConfig.
   retriex.llm.call_models:
-    input_normalization: null
-    shop_query_optimization: null
+    input_normalization: 'llama3.1'
+    shop_query_optimization: 'llama3.1'
     final_answer: null