diff --git a/nix/build-all.py b/nix/build-all.py
index 7da77521e4..fdb7917d87 100644
--- a/nix/build-all.py
+++ b/nix/build-all.py
@@ -448,15 +448,15 @@ def build_dependency(
         "ctest",
         "bjam",
     ],
-    build_tool_args: list[str],
+    build_tool_args: 'list[str]',
     download_url: str,
     download_name: str,
     download_tool: Literal["py", "git"] = download_tool_default,
-    revision: Union[str, None] = None,
-    patch: Union[str, list[str], None] = None,
+    revision: 'Union[str, None]' = None,
+    patch: 'Union[str, list[str], None]' = None,
     shell=None,
     pre_compile_subs: 'Sequence[tuple[str, str, str]]' = (),
-    additional_files: Union[dict[str, str], None] = None,
+    additional_files: 'Union[dict[str, str], None]' = None,
     no_append_name=False,
     **kwargs,
 ) -> None: