diff --git a/src/rattler_build_conda_compat/recipe_sources.py b/src/rattler_build_conda_compat/recipe_sources.py
index dcdf3c4..af7a66e 100644
--- a/src/rattler_build_conda_compat/recipe_sources.py
+++ b/src/rattler_build_conda_compat/recipe_sources.py
@@ -154,7 +154,9 @@ def render(template: str | list[str], context: dict[str, str]) -> str | list[str
                     elem_dict = typing.cast(dict[str, Any], elem)
                     sha256, md5 = None, None
                     if elem_dict.get("sha256") is not None:
-                        sha256 = typing.cast(str, render(str(elem_dict["sha256"]), context_variables))
+                        sha256 = typing.cast(
+                            str, render(str(elem_dict["sha256"]), context_variables)
+                        )
                     if elem_dict.get("md5") is not None:
                         md5 = typing.cast(str, render(str(elem_dict["md5"]), context_variables))
                     if "url" in elem_dict: