diff --git a/workflows/prefactor_calibrator.cwl b/workflows/prefactor_calibrator.cwl
index 6edee64a8c69e9f261678411a8c715739895f7ee..e6f543b5fb0d92cdedf31625268938397308c5ff 100644
--- a/workflows/prefactor_calibrator.cwl
+++ b/workflows/prefactor_calibrator.cwl
@@ -112,6 +112,10 @@ steps:
           - msin
       - id: skymodel
         source: make_sourcedb/sourcedb
+      - id: timeresolution
+        default: 1
+      - id: freqresolution
+        default: 1
     out:
       - id: msout
     run: ../subworkflow/ndppp_prep_cal.cwl