diff --git a/src/pdm/models/caches.py b/src/pdm/models/caches.py
index ef8c2f6d85..b763aa998e 100644
--- a/src/pdm/models/caches.py
+++ b/src/pdm/models/caches.py
@@ -3,7 +3,6 @@
 import contextlib
 import dataclasses
 import hashlib
-import io
 import json
 import os
 from functools import lru_cache
@@ -273,7 +272,7 @@ def get(self, key: str) -> bytes | None:
 
         return None
 
-    def get_body(self, key: str) -> io.FileIO | None:
+    def get_body(self, key: str) -> BinaryIO | None:
         path = self._get_cache_path(key)
         with contextlib.suppress(OSError):
             return cast(BinaryIO, open(f"{path}.body", "rb"))