diff --git a/workflows/prefactor_calibrator.cwl b/workflows/prefactor_calibrator.cwl
index e6f543b5fb0d92cdedf31625268938397308c5ff..96b939cc35d21eb06d0d93c3ca36d1923e43f2f6 100644
--- a/workflows/prefactor_calibrator.cwl
+++ b/workflows/prefactor_calibrator.cwl
@@ -23,6 +23,7 @@ inputs:
     'sbg:y': -850
   - id: memoryperc
     type: int
+    default: 20
     'sbg:x': -634
     'sbg:y': -411
   - id: baselines_to_flag