diff --git a/steps/blsmooth.cwl b/steps/blsmooth.cwl
index f1cbe6dc366f9bf388f54d48dafd276e4a8679d9..bc822bafc53035190808a72a6673462ab1e349e4 100644
--- a/steps/blsmooth.cwl
+++ b/steps/blsmooth.cwl
@@ -81,7 +81,7 @@ hints:
    dockerPull: 'prefactor:latest'
 requirements:
  - class: InitialWorkDirRequirement
-  listing:
+   listing:
     - entry: $(inputs.msin)
       writable: true
  - class: InlineJavascriptRequirement