diff --git a/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb b/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb
index cc7d8d3e31f5c560a7b701f59c7298876c821ea0..8dc0ff4d6f29b78e443b3d2702f134e7e90d07bf 100644
--- a/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb
+++ b/notebooks/Jungfrau/Jungfrau_Gain_Correct_and_Verify_NBC.ipynb
@@ -464,7 +464,7 @@
     "        # Copy the index for the new source\n",
     "        # Create count/first datasets at INDEX source.\n",
     "        ofile.copy(f'INDEX/{karabo_id}/DET/{karabo_da}:daqOutput/data',\n",
-    "                   f'INDEX/{rois_source}')\n",
+    "                   f'INDEX/{rois_source}/data')\n",
     "        ntrains = ofile['INDEX/trainId'].shape[0]\n",
     "        ctrl_source.create_index(ntrains)"
    ]