diff --git a/frontools/cache.py b/frontools/cache.py
index 3b25d87..bec534d 100644
--- a/frontools/cache.py
+++ b/frontools/cache.py
@@ -100,6 +100,7 @@ class FileCache(Cache[ResourceType]):
         key_slug = _get_key_slug(key)
         cache_directory = self.cache_base / self._name
         file_path = cache_directory.joinpath(*key_slug.split("&"))
+        file_path = file_path.parent / (file_path.name + '_')
         file_directory = file_path.parent
 
         if not file_directory.is_dir():