diff --git a/lib/ulib/support/cgilsxml.py b/lib/ulib/support/cgilsxml.py
index a9e0c68..6899bec 100755
--- a/lib/ulib/support/cgilsxml.py
+++ b/lib/ulib/support/cgilsxml.py
@@ -183,6 +183,7 @@ def print_files(files, fgroups=None, select_group=None, script_name=None, query_
     xenv = ET.SubElement(xresult, "env")
     if script_name is not None:
         ET.SubElement(xenv, "script_name").text = _u(script_name)
+        ET.SubElement(xenv, "script_base").text = _u(re.sub(r'[^/]+$', '', script_name))
     if query_string is not None:
         query_string = _u(query_string)
         ET.SubElement(xenv, "query_string").text = query_string