diff --git a/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py b/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py
index 3e2d23116..4b46da56a 100644
--- a/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py
+++ b/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py
@@ -524,7 +524,7 @@ class FullTypeDescriptionDict(TypedDict):
 
 def extract_full_type_description(
     output_type_name: str,
-    type_map: dict[str, SerializeIndividualTypeDescriptionDict]
+    type_map: Dict[str, SerializeIndividualTypeDescriptionDict]
 ) -> FullTypeDescriptionDict:
     # Traverse reference graph to narrow down the references for the output type
     output_type = type_map[output_type_name]