diff --git a/lofar-cwl/steps/DPPP.cwl b/lofar-cwl/steps/DPPP.cwl
index 17005aba9681c9e66fb293bd574331935a4cedca..a756093a275e63decbec9ed6425628dfb5efedb9 100755
--- a/lofar-cwl/steps/DPPP.cwl
+++ b/lofar-cwl/steps/DPPP.cwl
@@ -42,6 +42,12 @@ inputs:
     default: true
     inputBinding:
       prefix: -msin.autoweight=True
+  - id: baseline
+    type: string
+    default: ""
+    inputBinding:
+      prefix: -msin.baseline=
+      separate: false
 outputs:
   - id: msout
     doc: Output Measurement Set