diff --git a/src/australianimagingservice/mri/human/neuro/t1w/preprocess.py b/src/australianimagingservice/mri/human/neuro/t1w/preprocess.py
index 5c3cc67..ce8364d 100644
--- a/src/australianimagingservice/mri/human/neuro/t1w/preprocess.py
+++ b/src/australianimagingservice/mri/human/neuro/t1w/preprocess.py
@@ -512,11 +512,11 @@ def join_task_catalogue(
             ),
             (
                 "target_subject_id",
-                str,
+                Directory,
                 {
                     "help_string": "target subject",
                     "argstr": "--trgsubject",
-                    "mandatory": True,
+                    "mandatory": False,
                 },
             ),
         ],
@@ -828,7 +828,7 @@ def join_task_catalogue(
                 input_spec=mri_a2a_input_spec,
                 output_spec=mri_a2a_output_spec,
                 cache_dir=cache_dir,
-                subject=wf.mri_s2s_task_lh.lzout.target_subject_id,  # create dependency on lh and rh annot files having been created
+                subject=wf.mri_s2s_task_rh.lzout.target_subject_id,  # create dependency on lh and rh annot files having been created
                 new_ribbon=True,
                 annotname=wf.join_task.lzout.annot_short,
             )