diff --git a/corrlib/meas_io.py b/corrlib/meas_io.py
index a87e227..48017a1 100644
--- a/corrlib/meas_io.py
+++ b/corrlib/meas_io.py
@@ -175,7 +175,7 @@ def load_records(path: Path, meas_paths: list[str], preloaded: dict[str, Any] =
                 if cache_enabled(path):
                     if not os.path.exists(cache_dir(path, file)):
                         os.makedirs(cache_dir(path, file))
-                    dump_object(preloaded[file][key], cache_path(path, file, key))
+                    dump_object(preloaded[file][key], str(cache_path(path, file, key)))
     return returned_data