diff --git a/melamine/classes.py b/melamine/classes.py
index 95c8e43..08789c7 100644
--- a/melamine/classes.py
+++ b/melamine/classes.py
@@ -3,7 +3,6 @@ import hashlib
 from collections.abc import Generator
 from pathlib import Path
 from secrets import token_bytes
-from typing import List
 from typing import Set
 from typing import Union
 
@@ -40,7 +39,7 @@ class ShredDir(AsyncObject):
         stat = await path.stat()
         self.inode = stat.st_ino
 
-    async def _get_contents(self, recursive: bool) -> List:
+    async def _get_contents(self, recursive: bool) -> Set:
         tasks = []
         async for subpath in self.absolute_path.glob("*"):
             if await subpath.is_dir():
@@ -52,8 +51,8 @@ class ShredDir(AsyncObject):
                 else:
                     logger.warning(f"Subdirectory found: {subpath}, skipping (see -r/--recursive))")
             elif subpath.is_file():
-                tasks.append(await ShredFile(subpath))
-        return await asyncio.gather(*tasks)
+                tasks.append(ShredFile(subpath))
+        return set(await asyncio.gather(*tasks))
 
     def enumerate_mount_points(self) -> Generator:
         for item in self.contents: