diff --git a/corrlib/meas_io.py b/corrlib/meas_io.py
index de19727..a87e227 100644
--- a/corrlib/meas_io.py
+++ b/corrlib/meas_io.py
@@ -238,7 +238,7 @@ def preload(path: Path, file: Path) -> dict[str, Any]:
         The data read from the file.
     """
     get(path, file)
-    filedict: dict[str, Any] = pj.load_json_dict(path / file)
+    filedict: dict[str, Any] = pj.load_json_dict(str(path / file))
     print("> read file")
     return filedict