diff --git a/xcp_d/cli/parser.py b/xcp_d/cli/parser.py
index 02f9c2826..4c8f01d27 100644
--- a/xcp_d/cli/parser.py
+++ b/xcp_d/cli/parser.py
@@ -102,11 +102,12 @@ def _build_parser():
         '--task_id',
         dest='task_id',
         action='store',
+        nargs='*',
         help=(
-            'The name of a specific task to postprocess. '
+            'The name(s) of specific task(s) to postprocess. '
             'By default, all tasks will be postprocessed. '
             'If you want to select more than one task to postprocess (but not all of them), '
-            'you can either run XCP-D with the --task-id parameter, separately for each task, '
+            'you can provide a space-delimited list of task names with the --task-id parameter, '
             'or you can use the --bids-filter-file to specify the tasks to postprocess.'
         ),
     )
diff --git a/xcp_d/config.py b/xcp_d/config.py
index d00e811cf..6e0ae36aa 100644
--- a/xcp_d/config.py
+++ b/xcp_d/config.py
@@ -91,6 +91,7 @@
 import os
 from multiprocessing import set_start_method
 
+from bids.utils import listify
 from templateflow.conf import TF_LAYOUT
 
 # Disable NiPype etelemetry always
@@ -421,7 +422,7 @@ class execution(_Config):
     participant_label = None
     """List of participant identifiers that are to be preprocessed."""
     task_id = None
-    """Select a particular task from all available in the dataset."""
+    """Select particular tasks from all available in the dataset."""
     templateflow_home = _templateflow_home
     """The root folder of the TemplateFlow client."""
     work_dir = Path('work').absolute()
@@ -517,7 +518,7 @@ def _process_value(value):
         if cls.task_id:
             cls.bids_filters = cls.bids_filters or {}
             cls.bids_filters['bold'] = cls.bids_filters.get('bold', {})
-            cls.bids_filters['bold']['task'] = cls.task_id
+            cls.bids_filters['bold']['task'] = listify(cls.task_id)
 
         dataset_links = {
             'preprocessed': cls.fmri_dir,