diff --git a/daq/src/mxlibs3/jfjoch.py b/daq/src/mxlibs3/jfjoch.py
index 9f301752..7e463025 100644
--- a/daq/src/mxlibs3/jfjoch.py
+++ b/daq/src/mxlibs3/jfjoch.py
@@ -112,7 +112,7 @@ class JFJochWrapper:
             ntrigger= trigger,
             images_per_trigger=images,
             detector_distance_mm=s.diffraction.dtz_mm,
-            file_prefix=f"{pgroup}/raw/{r.file_prefix}",
+            file_prefix=f"{pgroup}/raw/raster/{r.file_prefix}",
             incident_energy_keV=s.diffraction.energy_keV,
             grid_scan=grid_settings,
             sample_name=sample,