diff --git a/semantic_router/layer.py b/semantic_router/layer.py
index c868d29c2abee2a91c7334b69217104d80a437cc..1a0dbf18f617f435c7ae4c854ac5a9fd422b157b 100644
--- a/semantic_router/layer.py
+++ b/semantic_router/layer.py
@@ -427,7 +427,8 @@ class RouteLayer:
                 if route.function_schemas
                 else [{}] * len(route.utterances)
             ),
-            metadata_list=[route.metadata if route.metadata else {}] * len(route.utterances),
+            metadata_list=[route.metadata if route.metadata else {}]
+            * len(route.utterances),
         )
 
         self.routes.append(route)