diff --git a/lib/ep3/init/cwl2wfnet.rb b/lib/ep3/init/cwl2wfnet.rb
index 3739267..8b25b57 100755
--- a/lib/ep3/init/cwl2wfnet.rb
+++ b/lib/ep3/init/cwl2wfnet.rb
@@ -457,6 +457,8 @@ def wfnet(cwl)
       if hash[:index].nil?
         if hash[:nextParam].nil?
           nil
+        elsif hash[:prevParam].nil?
+          %Q!#{hash[:nextParam]}: #{JSON.dump(hash[:default].to_h)}!
         elsif hash[:default].instance_of?(InvalidValue)
           %Q!#{hash[:nextParam]}: .[#{idx}].#{hash[:prevParam]}!
         else