diff --git a/backend/app/settings.py b/backend/app/settings.py
index ceec7ba..55fe1e8 100644
--- a/backend/app/settings.py
+++ b/backend/app/settings.py
@@ -13,7 +13,7 @@ def get_node_postprocessors():
     rerank_model = os.getenv("RERANK_MODEL")
     rerank_url = os.getenv("RERANK_BASE_URL")
     postprocess = None
-    if rerank_model is None:
+    if rerank_model is not None:
         postprocess = [XinferenceRerank(rerank_model, rerank_url)]
     return postprocess