diff --git a/steps/format_metrics.cwl b/steps/format_metrics.cwl
index 3c11185e6a4d15c2511017cb3fad22f71ebc6da5..fe3538c9011db505a33879fddadf89104f8fa4c2 100644
--- a/steps/format_metrics.cwl
+++ b/steps/format_metrics.cwl
@@ -12,13 +12,9 @@ inputs:
 - id: quality
   type: Any
 - id: msin
-  type:
-    type: array
-    items: Directory
+  type: Directory[]
 - id: keep_input
-  type:
-    type: array
-    items: boolean
+  type: boolean[]
 - id: applied_fixes
   type:
     type: array