diff --git a/pyproject.toml b/pyproject.toml
index 8689255..b3c0e01 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -94,7 +94,6 @@ ignore = [
     "RUF012",
     "ANN204",
     "SIM110",
-    "E741",
     "C901",
 ]
 
diff --git a/raillabel/format/_object_annotation.py b/raillabel/format/_object_annotation.py
index 3613841..d69ed6f 100644
--- a/raillabel/format/_object_annotation.py
+++ b/raillabel/format/_object_annotation.py
@@ -110,7 +110,7 @@ def _attributes_fromdict(
         if "attributes" not in data_dict:
             return {}
 
-        return {a["name"]: a["val"] for l in data_dict["attributes"].values() for a in l}
+        return {a["name"]: a["val"] for type_ in data_dict["attributes"].values() for a in type_}
 
     # === Special Methods ====================================================