diff --git a/cwltool/main.py b/cwltool/main.py
index 2347e70cd..c724f0ffe 100755
--- a/cwltool/main.py
+++ b/cwltool/main.py
@@ -910,6 +910,9 @@ def main(argsl=None,  # type: List[str]
             if out is not None:
 
                 def locToPath(p):
+                    for field in ("path", "nameext", "nameroot", "dirname"):
+                        if field in p:
+                            del p[field]
                     if p["location"].startswith("file://"):
                         p["path"] = uri_file_path(p["location"])