diff --git a/nibabies/workflows/base.py b/nibabies/workflows/base.py
index 383186c7..e8624091 100644
--- a/nibabies/workflows/base.py
+++ b/nibabies/workflows/base.py
@@ -373,6 +373,7 @@ def init_single_subject_wf(
             anat_only=config.workflow.anat_only,
             anat_derivatives=anatomical_cache or None,
             subject_id=subject_id,
+            require_t1w=False,
         ),
         name='bidssrc',
     )