diff --git a/workflows/linc_target.cwl b/workflows/linc_target.cwl
index 4ff7af68d8115ebca7df7a2bcda092ddb414b286..22584ed25e6bed871d1d6f0b5cc11a9eb0105451 100644
--- a/workflows/linc_target.cwl
+++ b/workflows/linc_target.cwl
@@ -241,7 +241,7 @@ steps:
         source: 
           - num_SBs_per_group
           - selfcal
-        valueFrom: '$(self[0] == null ? (self[-1] ? -1 : null) : self[0])'
+        valueFrom: '$(self[0] == null ? (self[1] ? -1 : null) : self[0])'
       - id: reference_stationSB
         source: reference_stationSB
       - id: filter_baselines