diff --git a/bsp_tool/base.py b/bsp_tool/base.py
index d6cda20..f1a31c0 100644
--- a/bsp_tool/base.py
+++ b/bsp_tool/base.py
@@ -148,12 +148,12 @@ def unmount_file(self, filename: str):
         self.extras.pop(filename)
 
     @classmethod
-    def from_archive(cls, branch: ModuleType, filepath: str, archive, mount_extras=False) -> Bsp:
-        bsp = cls.from_bytes(branch, filepath, archive.read(filepath))
+    def from_archive(cls, branch: ModuleType, filepath: str, parent_archive, mount_extras=False) -> Bsp:
+        bsp = cls.from_bytes(branch, filepath, parent_archive.read(filepath))
         if mount_extras:
             extras = [
                 filename
-                for filename in archive.listdir(bsp.folder)
+                for filename in parent_archive.listdir(bsp.folder)
                 for pattern in bsp.extra_patterns()
                 if fnmatch.fnmatch(filename, pattern)]
             for filename in extras: