diff --git a/steps/DPPP.cwl b/steps/DPPP.cwl
index dfd2cdcbd581d9f7140df3f3456f6e48565875d5..b7f2dd56a92913e3adbbcea5370d4a3b978d2a98 100755
--- a/steps/DPPP.cwl
+++ b/steps/DPPP.cwl
@@ -49,6 +49,7 @@ inputs:
     inputBinding:
       position: 0
       prefix: '-msout.storagemanager='
+      separate: false
   - default: ''
     id: baseline
     type: string
@@ -62,12 +63,14 @@ inputs:
     inputBinding:
       position: 0
       prefix: '-msout.datacolumn='
+      separate: false
   - default: DATA
     id: input_column
     type: string?
     inputBinding:
       position: 0
       prefix: '-msin.datacolumn='
+      separate: false
 outputs:
   - id: msout
     doc: Output Measurement Set