diff --git a/fastapi/utils.py b/fastapi/utils.py
index 40bff3279..774c5b982 100644
--- a/fastapi/utils.py
+++ b/fastapi/utils.py
@@ -137,11 +137,10 @@ def generate_operation_id_for_path(
 
 
 def generate_unique_id(route: "APIRoute") -> str:
-    operation_id = route.name + route.path_format
-    operation_id = re.sub("[^0-9a-zA-Z_]", "_", operation_id)
+    route_path_name = route.name + route.path_format
+    operation_id = re.sub("[^0-9a-zA-Z_]", "_", route_path_name)
     assert route.methods
-    operation_id = f"{operation_id}_{list(route.methods)[0].lower()}"
-    return operation_id
+    return f"{operation_id}_{list(route.methods)[0].lower()}"
 
 
 def deep_dict_update(main_dict: Dict[Any, Any], update_dict: Dict[Any, Any]) -> None: