diff --git a/recopytex/database/filesystem/loader.py b/recopytex/database/filesystem/loader.py
index baa102c..27d8130 100644
--- a/recopytex/database/filesystem/loader.py
+++ b/recopytex/database/filesystem/loader.py
@@ -100,7 +100,7 @@ class CSVLoader(Loader):
                 exam = extract_fields(csv, fields)
                 exam = self.rename_columns(exam)
                 exam = exam.rename(columns={"exam": "name"})
-                exam["origin"] = csv
+                exam["origin"] = str(csv)
                 exam["tribe"] = tribe
                 exam["id"] = build_id(
                     self._config["id_templates"]["exam"], exam.iloc[0]