diff --git a/product/ERP5Form/ListBox.py b/product/ERP5Form/ListBox.py
index 4d74df4abc2b0568a578e99845ae52c94b8b51f8..4898aa5d0016aae6e286a4c775618e15958837f0 100644
--- a/product/ERP5Form/ListBox.py
+++ b/product/ERP5Form/ListBox.py
@@ -367,9 +367,11 @@ class ListBoxWidget(Widget.Widget):
           Render a ListBox in read-only.
         """
         if REQUEST is None: REQUEST=get_request()
-        return self.render(field, key, value, REQUEST, render_format=render_format)
+        return self.render(field, key, value, REQUEST, render_format=render_format,
+                           render_prefix=render_prefix)
 
-    def render(self, field, key, value, REQUEST, render_format='html', render_prefix=None):
+    def render(self, field, key, value, REQUEST, render_format='html',
+               render_prefix=None):
         """
           This is where most things happen. This method renders a list
           of items