diff --git a/rag/llm/rerank_model.py b/rag/llm/rerank_model.py
index 7e6b73403..ba81273ce 100644
--- a/rag/llm/rerank_model.py
+++ b/rag/llm/rerank_model.py
@@ -71,6 +71,7 @@ class DefaultRerank(Base):
         res = []
         for i in range(0, len(pairs), batch_size):
             scores = self._model.compute_score(pairs[i:i + batch_size], max_length=2048)
+            scores = sigmoid(np.array(scores)).tolist()
             if isinstance(scores, float): res.append(scores)
             else:  res.extend(scores)
         return np.array(res), token_count