diff --git a/common/python/nomadcore/md_data_access/MDDataAccess.py b/common/python/nomadcore/md_data_access/MDDataAccess.py
index 6b2254df9eff7f5958394fca4bc35093fba91b73..9e9d0e3da132e2463d664bb68b34c1e8c295a7f7 100644
--- a/common/python/nomadcore/md_data_access/MDDataAccess.py
+++ b/common/python/nomadcore/md_data_access/MDDataAccess.py
@@ -2413,7 +2413,7 @@ class MDDataAccess(object):
                     loader = mdt_FormatRegistry.loaders[trajformat]
                 except KeyError:
                     return
-                t = loader(filename)
+                t = loader(trajfile)
                 for i in range(0, len(t), chunk):
                     positions = t[i:i+chunk]
                     for pos in positions: